Today's Message Index:
----------------------
1. 02:55 AM - Re: Vacuume pressure warning light (Ivor Phillips)
2. 03:42 AM - Re: wiring the 2-50 switch (JOHN TIPTON)
3. 05:20 AM - Re: Vacuume pressure warning light (Michael Hinchcliff)
4. 05:29 AM - Re: Re: S700 2-50 switch wiring (Frank Stringham)
5. 05:34 AM - Re: Vacuume pressure warning light (rd2@evenlink.com)
6. 06:19 AM - Re: Vacuume pressure warning light (Michael Hinchcliff)
7. 06:22 AM - Re: wiring the 2-50 switch (Michael T. Ice)
8. 06:38 AM - Re: Re: S700 2-50 switch wiring (Michael T. Ice)
9. 06:54 AM - Re: Re: S700 2-50 switch wiring (Michael T. Ice)
10. 10:16 AM - Re: Vacuume pressure warning light (Ken)
11. 12:13 PM - Re: Vacuume pressure warning light (Michael Hinchcliff)
12. 01:04 PM - Re: Vacuume pressure warning light (Ken)
13. 01:38 PM - please remove me from list thanks (Leigh and Paul)
14. 01:59 PM - Re: The hottest T-shirt at Oshkosh ()
15. 02:31 PM - Very bad RFI (Dave Dugas)
16. 02:38 PM - Re: Vacuume pressure warning light (Michael Hinchcliff)
17. 03:40 PM - Re: Very bad RFI (Robert Feldtman)
18. 04:06 PM - Re: Vacuume pressure warning light (Bob McCallum)
19. 04:22 PM - Re: wiring the 2-50 switch (Robert L. Nuckolls, III)
20. 04:22 PM - Home from OSH but still out of service for a bit (Robert L. Nuckolls, III)
21. 04:35 PM - Re: Vacuume pressure warning light (Kevin Horton)
22. 05:02 PM - Re: Vacuume pressure warning light (Bob McCallum)
23. 05:08 PM - Re: Vacuume pressure warning light (Ken)
24. 05:19 PM - Re: Very bad RFI (Ken)
25. 05:32 PM - Re: Vacuume pressure warning light (Michael Hinchcliff)
26. 05:39 PM - Re: Vacuume pressure warning light (Michael Hinchcliff)
27. 06:55 PM - Re: Vacuume pressure warning light (Kenneth Melvin)
28. 07:50 PM - Re: DIY - In the ear headphones (Edward G. Savage)
29. 09:13 PM - Re: Vacuume pressure warning light (Tammy and Mike Salzman)
Message 1
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Subject: | Vacuume pressure warning light |
I have used a XV600 vacuum switch with three terminals, One N/C and one
N/O so I can have both a vacuum low warning light and a engine tach time
from the one instrument, You can adjust the switch to suit your
installation ,
http://www.valvesystems.co.uk/catalog/Type-XV600-Vacuum-Switches-p-1-c-5
0.html
regards
Ivor Phillips
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Michael Hinchcliff
Sent: 28 July 2007 00:32
Subject: AeroElectric-List: Vacuume pressure warning light
I would like to add a vacuum pressure warning light to my ship's panel.
What do you guys recommend? Is there a particular vacuum pressure
switch that I can connect to my vac line that will illuminate a panel
lamp in the event the vacuum pressure slides to an unsafe level - or is
there another (better) way to do this?
Michael H.
Message 2
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Subject: | Re: wiring the 2-50 switch |
Hi Guys
As a matter of interest from whom do you get your (e.g.: 2-50) switches from
Cheers
John PPL-England - - RV-9a 'wings'
----- Original Message -----
From: "glaesers" <glaesers@wideopenwest.com>
Sent: Saturday, July 28, 2007 4:15 AM
Subject: AeroElectric-List: wiring the 2-50 switch
> <glaesers@wideopenwest.com>
>
> Frank,
>
> If you have the AeroElectric Connection manual - see page 11-18.
>
> Looking at the back of the 2-50 switch, with the keyway UP, the contact
> numbers are:
>
> 6 - 3
> 5 - 2 -- power IN to contacts 2 and 5 - each side is independent (4-5-6
> independent of 1-2-3)
> 4 - 1
>
> When the switch is in the DOWN position (opposite the keyway):
> - contacts 5 and 6 are connected
> - contacts 2 and 3 are connected
>
> When the switch is in the MIDDLE position:
> - contacts 5 and 6 are still connected
> - contacts 2 and 1 are connected (no power to 3)
>
> In the UP (momentary position):
> - contacts 5 and 4 are connected (no power to 6) - so the 5-4 combination
> is the only one that is 'momentary'
> - contacts 2 and 1 are connected (no power to 3)
>
> Hope this helps.
>
> Dennis Glaeser
>
>
>
Message 3
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Subject: | Re: Vacuume pressure warning light |
Yes, this should work nicely. Thank you!
----- Original Message -----
From: <rd2@evenlink.com>
Sent: Friday, July 27, 2007 7:47 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
> Michael-
>
> This switch, along with a blinking LED, should work fine:
>
> http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
> ame
>
> The chamber is SS.
>
> The problem is, it would need a field approval for certified aircraft -
> and
> local FSDO's may not be very sympathetic to messing with the vac system.
> I'd like to get my hnads on such a field approval for my own installation.
> Anyone?
>
> Best
> Rumen
>
>
> _____________________Original message __________________________
> (received from Michael Hinchcliff; Date: 06:32 PM
> 7/27/2007 -0500)
> ________________________________________________________________
>
> I would like to add a vacuum pressure warning light to my ship's panel.
> What do you guys recommend? Is there a particular vacuum pressure switch
> that I can connect to my vac line that will illuminate a panel lamp in the
> event the vacuum pressure slides to an unsafe level - or is there another
> (better) way to do this?
>
> Michael H.
>
>
>
Message 4
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Subject: | Re: S700 2-50 switch wiring |
Mike
It appears that all roads as they say lead to Rome or in this case to the
motor working. #2 to power bus, #5 to ground #1 to red wire from pump motor
# 6 to black wire from pump, #1 to #3 gives me continuity in toggle mid and
momentary up position.
Thanks for the help I am still wrestling with this is the final results for
the aux fuel pump/prime.
Frank @ SGU RV7A Wiring
>From: "Michael T. Ice" <aurbo@ak.net>
>To: aeroelectric-list@matronics.com
>Subject: Re: AeroElectric-List: Re: S700 2-50 switch wiring
>Date: Fri, 27 Jul 2007 18:44:18 -0800
>
>
>Frank,
>
>On the Z-11 drawing it shows that the power from the main bus goes to #5
>with a jumper to #2. Why do you have a ground on #5? The grounds go on the
>other side of the fuel pumps and it shows both of them grounded to the
>panel. It seems to me that the way you describe it you have the switch
>shorted out.
>
>I am not an electrical genius just another guy wiring up an RV so I hope
>you get some other suggestions.
>
>Mike Ice
>Fire wall forward, rewiring the mag switches for emag/pmag, adding
>accessories to the motor.
>
>----- Original Message ----- From: "Frank Stringham"
><fstringham@hotmail.com>
>To: <aeroelectric-list@matronics.com>
>Sent: Friday, July 27, 2007 1:43 PM
>Subject: AeroElectric-List: Re: S700 2-50 switch wiring
>
>
>><fstringham@hotmail.com>
>>
>>
>>
>>
>>HELP!!!!!!!!!!!
>>
>>I am using an S700 2-50 switch to activate my fuel pump. So far I have
>>been unable to brake the code. I have so far used multiple schemes
>>.......I can get it to work to this point....toggle down OFF.....toogle
>>mid position (on)......toggle up notta?????????????...for the momentary
>>on. Right now I have #2 to power bus, #5 to ground, #1 to pump
>>motor...red, #6 to pump motor....black , and #3 to #6.
>>
>>Thanks for any and all suggestions.
>>
>>Frank @ SGU RV7A Panel Complete except for HS34....Wiring underway
>>
>>_________________________________________________________________
>>http://newlivehotmail.com
>>
>>
>>
>>
>>
>>
>
>
_________________________________________________________________
Message 5
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|
Subject: | Re: Vacuume pressure warning light |
You are welcome.
Rumen
do not archive
_____________________Original message __________________________
(received from Michael Hinchcliff; Date: 07:14 AM
7/28/2007 -0500)
________________________________________________________________
<cfi@conwaycorp.net>
Yes, this should work nicely. Thank you!
----- Original Message -----
From: <rd2@evenlink.com>
Sent: Friday, July 27, 2007 7:47 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
> Michael-
>
> This switch, along with a blinking LED, should work fine:
>
> http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
> ame
>
> The chamber is SS.
>
> The problem is, it would need a field approval for certified aircraft -
> and
> local FSDO's may not be very sympathetic to messing with the vac system.
> I'd like to get my hnads on such a field approval for my own installation.
> Anyone?
>
> Best
> Rumen
>
>
> _____________________Original message __________________________
> (received from Michael Hinchcliff; Date: 06:32 PM
> 7/27/2007 -0500)
> ________________________________________________________________
>
> I would like to add a vacuum pressure warning light to my ship's panel.
> What do you guys recommend? Is there a particular vacuum pressure switch
> that I can connect to my vac line that will illuminate a panel lamp in the
> event the vacuum pressure slides to an unsafe level - or is there another
> (better) way to do this?
>
> Michael H.
>
>
>
--
6:08 AM
Message 6
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|
Subject: | Re: Vacuume pressure warning light |
My VistaPrint Electronic Business CardIvor, I'm sure this would have
worked fine, but I'm in the U.S. Thanks for sharing.
Do not archive.
----- Original Message -----
From: Ivor Phillips
To: aeroelectric-list@matronics.com
Sent: Saturday, July 28, 2007 4:49 AM
Subject: RE: AeroElectric-List: Vacuume pressure warning light
I have used a XV600 vacuum switch with three terminals, One N/C and
one N/O so I can have both a vacuum low warning light and a engine tach
time from the one instrument, You can adjust the switch to suit your
installation ,
http://www.valvesystems.co.uk/catalog/Type-XV600-Vacuum-Switches-p-1-c-50
.html
regards
Ivor Phillips
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Michael Hinchcliff
Sent: 28 July 2007 00:32
To: aeroelectric-list@matronics.com
Subject: AeroElectric-List: Vacuume pressure warning light
I would like to add a vacuum pressure warning light to my ship's
panel. What do you guys recommend? Is there a particular vacuum
pressure switch that I can connect to my vac line that will illuminate a
panel lamp in the event the vacuum pressure slides to an unsafe level -
or is there another (better) way to do this?
Michael H.
- The AeroElectric-List Email Forum - -->
http://www.matronics.com/Navigator?AeroElectric-List - NEW
MATRONICS WEB FORUMS - --> http://forums.matronics.com
Message 7
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|
Subject: | Re: wiring the 2-50 switch |
John,
I get all my switches from B&C, www.bandc.biz/.
Mike
----- Original Message -----
From: "JOHN TIPTON" <jmtipton@btopenworld.com>
Sent: Saturday, July 28, 2007 2:29 AM
Subject: Re: AeroElectric-List: wiring the 2-50 switch
> <jmtipton@btopenworld.com>
>
> Hi Guys
>
> As a matter of interest from whom do you get your (e.g.: 2-50) switches
> from
>
> Cheers
>
> John PPL-England - - RV-9a 'wings'
>
>
> ----- Original Message -----
> From: "glaesers" <glaesers@wideopenwest.com>
> To: <AeroElectric-List@matronics.com>; <fstringham@hotmail.com>
> Sent: Saturday, July 28, 2007 4:15 AM
> Subject: AeroElectric-List: wiring the 2-50 switch
>
>
>> <glaesers@wideopenwest.com>
>>
>> Frank,
>>
>> If you have the AeroElectric Connection manual - see page 11-18.
>>
>> Looking at the back of the 2-50 switch, with the keyway UP, the contact
>> numbers are:
>>
>> 6 - 3
>> 5 - 2 -- power IN to contacts 2 and 5 - each side is independent (4-5-6
>> independent of 1-2-3)
>> 4 - 1
>>
>> When the switch is in the DOWN position (opposite the keyway):
>> - contacts 5 and 6 are connected
>> - contacts 2 and 3 are connected
>>
>> When the switch is in the MIDDLE position:
>> - contacts 5 and 6 are still connected
>> - contacts 2 and 1 are connected (no power to 3)
>>
>> In the UP (momentary position):
>> - contacts 5 and 4 are connected (no power to 6) - so the 5-4 combination
>> is the only one that is 'momentary'
>> - contacts 2 and 1 are connected (no power to 3)
>>
>> Hope this helps.
>>
>> Dennis Glaeser
>>
>>
>>
>>
>>
>>
>
>
>
Message 8
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|
Subject: | Re: S700 2-50 switch wiring |
Frank,
Are you using the AeroElectric schematics? If so look at the Z-11 figure and
you will see that to wire the fuel pump and primer you come off of the
endurance bus 3 amp fuse with a 22 awg wire to the #5, there is a jumper
that goes to #2, then there is a 22 awg wire that goes to the primer off of
#4 and a 22awg to the fuel boost pump off of #1. There are no grounds off of
the switch. The devices you are trying to power are grounded at the device
or run a ground from them back to your ground block.
I wired my switch just like I described and it works just fine.
How are you numbering the switch pole positions. With the keyway pointing up
and facing away from you. The numbers are from the bottom left 1, 2, 3 then
on the right bottom up, 4, 5, 6.. www.aeroelectric.com/articles/switches.pdf
The 2-50 switch is a real neat switch, it is an on-on-on switch. Perhaps to
get the switch to do what you want it to do you need an different switch?
Maybe next week when everyone is back from Oshkosh you will get a better
answer. I am heading out for the weekend to go hiking and camping in the
mountains, first this morning we will do some hovercraft flying. Good luck.
Mike
----- Original Message -----
From: "Frank Stringham" <fstringham@hotmail.com>
Sent: Saturday, July 28, 2007 4:26 AM
Subject: Re: AeroElectric-List: Re: S700 2-50 switch wiring
> <fstringham@hotmail.com>
>
> Mike
>
> It appears that all roads as they say lead to Rome or in this case to the
> motor working. #2 to power bus, #5 to ground #1 to red wire from pump
> motor # 6 to black wire from pump, #1 to #3 gives me continuity in toggle
> mid and momentary up position.
>
> Thanks for the help I am still wrestling with this is the final results
> for the aux fuel pump/prime.
>
> Frank @ SGU RV7A Wiring
>
>
>>From: "Michael T. Ice" <aurbo@ak.net>
>>To: aeroelectric-list@matronics.com
>>Subject: Re: AeroElectric-List: Re: S700 2-50 switch wiring
>>Date: Fri, 27 Jul 2007 18:44:18 -0800
>>
>>
>>Frank,
>>
>>On the Z-11 drawing it shows that the power from the main bus goes to #5
>>with a jumper to #2. Why do you have a ground on #5? The grounds go on the
>>other side of the fuel pumps and it shows both of them grounded to the
>>panel. It seems to me that the way you describe it you have the switch
>>shorted out.
>>
>>I am not an electrical genius just another guy wiring up an RV so I hope
>>you get some other suggestions.
>>
>>Mike Ice
>>Fire wall forward, rewiring the mag switches for emag/pmag, adding
>>accessories to the motor.
>>
>>----- Original Message ----- From: "Frank Stringham"
>><fstringham@hotmail.com>
>>To: <aeroelectric-list@matronics.com>
>>Sent: Friday, July 27, 2007 1:43 PM
>>Subject: AeroElectric-List: Re: S700 2-50 switch wiring
>>
>>
>>><fstringham@hotmail.com>
>>>
>>>
>>>
>>>
>>>HELP!!!!!!!!!!!
>>>
>>>I am using an S700 2-50 switch to activate my fuel pump. So far I have
>>>been unable to brake the code. I have so far used multiple schemes
>>>.......I can get it to work to this point....toggle down OFF.....toogle
>>>mid position (on)......toggle up notta?????????????...for the momentary
>>>on. Right now I have #2 to power bus, #5 to ground, #1 to pump
>>>motor...red, #6 to pump motor....black , and #3 to #6.
>>>
>>>Thanks for any and all suggestions.
>>>
>>>Frank @ SGU RV7A Panel Complete except for HS34....Wiring underway
>>>
>>>_________________________________________________________________
>>>http://newlivehotmail.com
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
> _________________________________________________________________
>
>
>
Message 9
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|
Subject: | Re: S700 2-50 switch wiring |
Frank,
I just realized it doesn't matter how you number that poles on the back of
the switch as long as you know that the two poles in the middles are #'s 2 &
5. The switch is actually 2 switches in one with the power lead going into
the middle position on each switch.
Have fun.
Mike
----- Original Message -----
From: "Frank Stringham" <fstringham@hotmail.com>
Sent: Saturday, July 28, 2007 4:26 AM
Subject: Re: AeroElectric-List: Re: S700 2-50 switch wiring
> <fstringham@hotmail.com>
>
> Mike
>
> It appears that all roads as they say lead to Rome or in this case to the
> motor working. #2 to power bus, #5 to ground #1 to red wire from pump
> motor # 6 to black wire from pump, #1 to #3 gives me continuity in toggle
> mid and momentary up position.
>
> Thanks for the help I am still wrestling with this is the final results
> for the aux fuel pump/prime.
>
> Frank @ SGU RV7A Wiring
>
>
>>From: "Michael T. Ice" <aurbo@ak.net>
>>To: aeroelectric-list@matronics.com
>>Subject: Re: AeroElectric-List: Re: S700 2-50 switch wiring
>>Date: Fri, 27 Jul 2007 18:44:18 -0800
>>
>>
>>Frank,
>>
>>On the Z-11 drawing it shows that the power from the main bus goes to #5
>>with a jumper to #2. Why do you have a ground on #5? The grounds go on the
>>other side of the fuel pumps and it shows both of them grounded to the
>>panel. It seems to me that the way you describe it you have the switch
>>shorted out.
>>
>>I am not an electrical genius just another guy wiring up an RV so I hope
>>you get some other suggestions.
>>
>>Mike Ice
>>Fire wall forward, rewiring the mag switches for emag/pmag, adding
>>accessories to the motor.
>>
>>----- Original Message ----- From: "Frank Stringham"
>><fstringham@hotmail.com>
>>To: <aeroelectric-list@matronics.com>
>>Sent: Friday, July 27, 2007 1:43 PM
>>Subject: AeroElectric-List: Re: S700 2-50 switch wiring
>>
>>
>>><fstringham@hotmail.com>
>>>
>>>
>>>
>>>
>>>HELP!!!!!!!!!!!
>>>
>>>I am using an S700 2-50 switch to activate my fuel pump. So far I have
>>>been unable to brake the code. I have so far used multiple schemes
>>>.......I can get it to work to this point....toggle down OFF.....toogle
>>>mid position (on)......toggle up notta?????????????...for the momentary
>>>on. Right now I have #2 to power bus, #5 to ground, #1 to pump
>>>motor...red, #6 to pump motor....black , and #3 to #6.
>>>
>>>Thanks for any and all suggestions.
>>>
>>>Frank @ SGU RV7A Panel Complete except for HS34....Wiring underway
>>>
>>>_________________________________________________________________
>>>http://newlivehotmail.com
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
> _________________________________________________________________
>
>
>
Message 10
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|
Subject: | Re: Vacuume pressure warning light |
Does this mean that you guys are running more than 6" vacuum in order to
put the warning light out?? I had thought that 5" was about normal??
I'm using a solid state sensor to feed my EIS but have only set the
regulator for about 5". However sometime after a hundred hours or so my
imported horizon became somewhat erratic and unreliable.
Ken
" New WASCO model 414-0005. Compact size vacuum switch. Single pole
contacts open at 6" Hg., close at 3" Hg. Factory setting non-adjustable.
Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port 1/8"
NPT. 30" Hg. max. Shpg. 1/4 lb.
rd2@evenlink.com wrote:
>
>Michael-
>
>This switch, along with a blinking LED, should work fine:
>
>http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>ame
>
>The chamber is SS.
>
>The problem is, it would need a field approval for certified aircraft - and
>local FSDO's may not be very sympathetic to messing with the vac system.
>I'd like to get my hnads on such a field approval for my own installation.
>Anyone?
>
>Best
>Rumen
>
>
>_____________________Original message __________________________
> (received from Michael Hinchcliff; Date: 06:32 PM
>7/27/2007 -0500)
>________________________________________________________________
>
>I would like to add a vacuum pressure warning light to my ship's panel.
>What do you guys recommend? Is there a particular vacuum pressure switch
>that I can connect to my vac line that will illuminate a panel lamp in the
>event the vacuum pressure slides to an unsafe level - or is there another
>(better) way to do this?
>
>Michael H.
>
>
Message 11
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|
Subject: | Re: Vacuume pressure warning light |
Yes, 5 in Hg is normal. I'm going to wire this so the light illuminates
when the pressure falls above the 6 inch Hg range (i.e. vac failure). If it
does not work out, I'll be out just 8 bucks.
----- Original Message -----
From: "Ken" <klehman@albedo.net>
Sent: Saturday, July 28, 2007 12:12 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
> Does this mean that you guys are running more than 6" vacuum in order to
> put the warning light out?? I had thought that 5" was about normal??
>
> I'm using a solid state sensor to feed my EIS but have only set the
> regulator for about 5". However sometime after a hundred hours or so my
> imported horizon became somewhat erratic and unreliable.
>
> Ken
>
> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
> contacts open at 6" Hg., close at 3" Hg. Factory setting non-adjustable.
> Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port 1/8"
> NPT. 30" Hg. max. Shpg. 1/4 lb.
>
> rd2@evenlink.com wrote:
>
>>
>>Michael-
>>
>>This switch, along with a blinking LED, should work fine:
>>
>>http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>>ame
>>
>>The chamber is SS.
>>
>>The problem is, it would need a field approval for certified aircraft -
>>and
>>local FSDO's may not be very sympathetic to messing with the vac system.
>>I'd like to get my hnads on such a field approval for my own installation.
>>Anyone?
>>
>>Best Rumen
>>
>>
>>_____________________Original message __________________________
>> (received from Michael Hinchcliff; Date: 06:32 PM
>>7/27/2007 -0500)
>>________________________________________________________________
>>
>>I would like to add a vacuum pressure warning light to my ship's panel.
>>What do you guys recommend? Is there a particular vacuum pressure switch
>>that I can connect to my vac line that will illuminate a panel lamp in the
>>event the vacuum pressure slides to an unsafe level - or is there another
>>(better) way to do this?
>> Michael H.
>>
>
>
>
Message 12
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|
Subject: | Re: Vacuume pressure warning light |
Hmmm I don't think that will work Michael. If I read this correctly, it
seems to me that switch will do nothing at all unless it has more than
6" of vacuum applied at every startup. After that then the contacts
would close at shutdown or whenever vacuum fell to less than 3".
Ken
Michael Hinchcliff wrote:
> <cfi@conwaycorp.net>
>
> Yes, 5 in Hg is normal. I'm going to wire this so the light
> illuminates when the pressure falls above the 6 inch Hg range (i.e.
> vac failure). If it does not work out, I'll be out just 8 bucks.
>
> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
> To: <aeroelectric-list@matronics.com>
> Sent: Saturday, July 28, 2007 12:12 PM
> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
>
>>
>> Does this mean that you guys are running more than 6" vacuum in order
>> to put the warning light out?? I had thought that 5" was about normal??
>>
>> I'm using a solid state sensor to feed my EIS but have only set the
>> regulator for about 5". However sometime after a hundred hours or so
>> my imported horizon became somewhat erratic and unreliable.
>>
>> Ken
>>
>> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
>> contacts open at 6" Hg., close at 3" Hg. Factory setting
>> non-adjustable. Contacts rated to 5 Amps at 230 volt AC. Spade
>> terminals 1/4". Port 1/8" NPT. 30" Hg. max. Shpg. 1/4 lb.
>>
>> rd2@evenlink.com wrote:
>>
>>>
>>> Michael-
>>>
>>> This switch, along with a blinking LED, should work fine:
>>>
>>> http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>>>
>>> ame
>>>
>>> The chamber is SS.
>>>
>>> The problem is, it would need a field approval for certified
>>> aircraft - and
>>> local FSDO's may not be very sympathetic to messing with the vac
>>> system.
>>> I'd like to get my hnads on such a field approval for my own
>>> installation.
>>> Anyone?
>>>
>>> Best Rumen
>>>
>>>
>>> _____________________Original message __________________________
>>> (received from Michael Hinchcliff; Date: 06:32 PM
>>> 7/27/2007 -0500)
>>> ________________________________________________________________
>>>
>>> I would like to add a vacuum pressure warning light to my ship's panel.
>>> What do you guys recommend? Is there a particular vacuum pressure
>>> switch
>>> that I can connect to my vac line that will illuminate a panel lamp
>>> in the
>>> event the vacuum pressure slides to an unsafe level - or is there
>>> another
>>> (better) way to do this?
>>> Michael H.
>>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 13
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Subject: | please remove me from list thanks |
Message 14
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|
Subject: | Re: The hottest T-shirt at Oshkosh |
Did not make Oshkosh but there is spirit. Super!
Of coruse its the hottest Tee-shirt.
I LOVE IT, but I want a cut of sales. Figure @ $50 a pop they'll
sell out. I think its hilarious. Some one has a sense of
humor, which is refreshing.
Life is too short and this is suppose to be fun. Peace.
My next shirt will be a big read circle with a diagonal &
the word CROWBAR, ha ha.
The Real GMCJETPILOT
PS I want Tee-shit with the NOT crossed out. LOL
>From: "Bruce Gray"
>Subject: RE: AeroElectric-List: The hottest T-shirt at Oshkosh
>
>A green t-shirt with block letters that said, "I am NOT gmcjetpilot".
>
>Bruce
---------------------------------
Choose the right car based on your needs. Check out Yahoo! Autos new Car Finder
tool.
Message 15
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|
Hello,
I joined this list with the hope that I could try to solve my problem in my Q2
with a Revmaster engine. At 450 hours on the engine I converted to auto plugs.
I changed the heads and replaced the aviation plug connection with auto plug
connections supplied with the conversion. The RFI is so bad that my transponder
reply light looks like a timing light. My Tru Trak auto pilot won't stay
booted up, and the noise is heard on my com. Things I've tried are...Lonestar
mag filters and eliminator power filter. Checking all grounds and relocating
several to a common grounding lug. Wrapping the plug connections with tin
foil to try to shield the interference. Checking all of the antenna connections.
Disconnecting various radios and avionics,trying to isolate a particular
source. Nothing worked.
I used my handheld radio in the cockpit and didn't pick up any noise. I also
called Revmaster and they is the ones who suggested trying the tin foil shielding.
The engine is carburated and uses a Bendix 3000 series dual mag. Plugs are NGK
resistor plugs, gapped at .016". Hopefully someone has a suggestion, or should
I consider going back to the aviation setup. Is there a different harness
that would work? The unfortunate thing is that any work that is done on the
magnito requires that the engine is removed enough to access the mag which is
recessed into the firewall. Thank you. Dave D.
---------------------------------
Message 16
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|
Subject: | Re: Vacuume pressure warning light |
Hello, Ken. Since the vacuum system will always initialize at atmospheric
pressure (29.92 Hg give or take) at each startup and then work it's way
down to 5" Hg after startup, the switch should work fine according to my
interpretation of the description, "Contact open at 6" Hg., close at 3" Hg".
I interpret that the contactor will be disengaged (i.e. light off) while
between 3-6" Hg, which is what I'm looking for. Please let me know if you
think I am overlooking something here.
----- Original Message -----
From: "Ken" <klehman@albedo.net>
Sent: Saturday, July 28, 2007 3:00 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
> Hmmm I don't think that will work Michael. If I read this correctly, it
> seems to me that switch will do nothing at all unless it has more than 6"
> of vacuum applied at every startup. After that then the contacts would
> close at shutdown or whenever vacuum fell to less than 3".
> Ken
>
> Michael Hinchcliff wrote:
>
>> <cfi@conwaycorp.net>
>>
>> Yes, 5 in Hg is normal. I'm going to wire this so the light illuminates
>> when the pressure falls above the 6 inch Hg range (i.e. vac failure). If
>> it does not work out, I'll be out just 8 bucks.
>>
>> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
>> To: <aeroelectric-list@matronics.com>
>> Sent: Saturday, July 28, 2007 12:12 PM
>> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>>
>>
>>>
>>> Does this mean that you guys are running more than 6" vacuum in order to
>>> put the warning light out?? I had thought that 5" was about normal??
>>>
>>> I'm using a solid state sensor to feed my EIS but have only set the
>>> regulator for about 5". However sometime after a hundred hours or so my
>>> imported horizon became somewhat erratic and unreliable.
>>>
>>> Ken
>>>
>>> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
>>> contacts open at 6" Hg., close at 3" Hg. Factory setting non-adjustable.
>>> Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port 1/8"
>>> NPT. 30" Hg. max. Shpg. 1/4 lb.
>>>
>>> rd2@evenlink.com wrote:
>>>
>>>>
>>>> Michael-
>>>>
>>>> This switch, along with a blinking LED, should work fine:
>>>>
>>>> http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>>>> ame
>>>>
>>>> The chamber is SS.
>>>>
>>>> The problem is, it would need a field approval for certified aircraft -
>>>> and
>>>> local FSDO's may not be very sympathetic to messing with the vac
>>>> system.
>>>> I'd like to get my hnads on such a field approval for my own
>>>> installation.
>>>> Anyone?
>>>>
>>>> Best Rumen
>>>>
>>>>
>>>> _____________________Original message __________________________
>>>> (received from Michael Hinchcliff; Date: 06:32 PM
>>>> 7/27/2007 -0500)
>>>> ________________________________________________________________
>>>>
>>>> I would like to add a vacuum pressure warning light to my ship's panel.
>>>> What do you guys recommend? Is there a particular vacuum pressure
>>>> switch
>>>> that I can connect to my vac line that will illuminate a panel lamp in
>>>> the
>>>> event the vacuum pressure slides to an unsafe level - or is there
>>>> another
>>>> (better) way to do this?
>>>> Michael H.
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
>
>
Message 17
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|
Subject: | Re: Very bad RFI |
I'll be interested to hear the replies on this. I am thinking about going to
auto plugs for the same RFI reason on my LOM engine (Czechoslovakian) -- I'm
planning on getting racing wire with 150 ohms per foot and shielding it with
braid (you can get it from Aircraft spruce) and grounding only the mag end,
and using heat shrink to hold the other end on the plug without a ground at
each end (which defeats the shield).. Keep us advised as to what you do.
bobf
On 7/28/07, Dave Dugas <davedq2@yahoo.com> wrote:
>
> Hello,
>
> I joined this list with the hope that I could try to solve my problem in
> my Q2 with a Revmaster engine. At 450 hours on the engine I converted to
> auto plugs. I changed the heads and replaced the aviation plug connection
> with auto plug connections supplied with the conversion. The RFI is so bad
> that my transponder reply light looks like a timing light. My Tru Trak auto
> pilot won't stay booted up, and the noise is heard on my com. Things I've
> tried are...Lonestar mag filters and eliminator power filter. Checking all
> grounds and relocating several to a common grounding lug. Wrapping the plug
> connections with tin foil to try to shield the interference. Checking all
> of the antenna connections. Disconnecting various radios
> and avionics,trying to isolate a particular source. Nothing worked.
>
> I used my handheld radio in the cockpit and didn't pick up any noise. I
> also called Revmaster and they is the ones who suggested trying the tin foil
> shielding.
>
> The engine is carburated and uses a Bendix 3000 series dual mag. Plugs
> are NGK resistor plugs, gapped at .016". Hopefully someone has a
> suggestion, or should I consider going back to the aviation setup. Is there
> a different harness that would work? The unfortunate thing is that any work
> that is done on the magnito requires that the engine is removed enough to
> access the mag which is recessed into the firewall. Thank you. Dave D.
>
>
Message 18
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|
Subject: | Re: Vacuume pressure warning light |
Michael;
The system starts out at give or take 29.92 inches of positive pressure,
then gets "sucked" down to "zero" positive pressure by the vacuum pump, then
gets sucked down further until 1" of vacuum (or negative pressure) is
created, then 2" of vacuum etc until finally you have, give or take, 5" of
vacuum. It will, in theory, never reach 6" of vacuum unless your vacuum
regulator fails and allows the pump to create "extra" vacuum if it's
capable. Your switch will therefore switch on as it passes 3" of vacuum, but
it will be "ON" at the normal vacuum of 5", it will never reach 6" to turn
"OFF", just the opposite of what you describe. (ON between 3 and 6, not OFF)
Bob McC
----- Original Message -----
From: "Michael Hinchcliff" <cfi@conwaycorp.net>
Sent: Saturday, July 28, 2007 5:31 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
<cfi@conwaycorp.net>
>
> Hello, Ken. Since the vacuum system will always initialize at atmospheric
> pressure (29.92 Hg give or take) at each startup and then work it's way
> down to 5" Hg after startup, the switch should work fine according to my
> interpretation of the description, "Contact open at 6" Hg., close at 3"
Hg".
> I interpret that the contactor will be disengaged (i.e. light off) while
> between 3-6" Hg, which is what I'm looking for. Please let me know if you
> think I am overlooking something here.
>
>
> ----- Original Message -----
> From: "Ken" <klehman@albedo.net>
> To: <aeroelectric-list@matronics.com>
> Sent: Saturday, July 28, 2007 3:00 PM
> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
>
> >
> > Hmmm I don't think that will work Michael. If I read this correctly, it
> > seems to me that switch will do nothing at all unless it has more than
6"
> > of vacuum applied at every startup. After that then the contacts would
> > close at shutdown or whenever vacuum fell to less than 3".
> > Ken
> >
> > Michael Hinchcliff wrote:
> >
> >> <cfi@conwaycorp.net>
> >>
> >> Yes, 5 in Hg is normal. I'm going to wire this so the light
illuminates
> >> when the pressure falls above the 6 inch Hg range (i.e. vac failure).
If
> >> it does not work out, I'll be out just 8 bucks.
> >>
> >> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
> >> To: <aeroelectric-list@matronics.com>
> >> Sent: Saturday, July 28, 2007 12:12 PM
> >> Subject: Re: AeroElectric-List: Vacuume pressure warning light
> >>
> >>
> >>>
> >>> Does this mean that you guys are running more than 6" vacuum in order
to
> >>> put the warning light out?? I had thought that 5" was about normal??
> >>>
> >>> I'm using a solid state sensor to feed my EIS but have only set the
> >>> regulator for about 5". However sometime after a hundred hours or so
my
> >>> imported horizon became somewhat erratic and unreliable.
> >>>
> >>> Ken
> >>>
> >>> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
> >>> contacts open at 6" Hg., close at 3" Hg. Factory setting
non-adjustable.
> >>> Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port
1/8"
> >>> NPT. 30" Hg. max. Shpg. 1/4 lb.
> >>>
> >>> rd2@evenlink.com wrote:
> >>>
> >>>>
> >>>> Michael-
> >>>>
> >>>> This switch, along with a blinking LED, should work fine:
> >>>>
> >>>>
http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
> >>>> ame
> >>>>
> >>>> The chamber is SS.
> >>>>
> >>>> The problem is, it would need a field approval for certified
aircraft -
> >>>> and
> >>>> local FSDO's may not be very sympathetic to messing with the vac
> >>>> system.
> >>>> I'd like to get my hnads on such a field approval for my own
> >>>> installation.
> >>>> Anyone?
> >>>>
> >>>> Best Rumen
> >>>>
> >>>>
> >>>> _____________________Original message __________________________
> >>>> (received from Michael Hinchcliff; Date: 06:32 PM
> >>>> 7/27/2007 -0500)
> >>>> ________________________________________________________________
> >>>>
> >>>> I would like to add a vacuum pressure warning light to my ship's
panel.
> >>>> What do you guys recommend? Is there a particular vacuum pressure
> >>>> switch
> >>>> that I can connect to my vac line that will illuminate a panel lamp
in
> >>>> the
> >>>> event the vacuum pressure slides to an unsafe level - or is there
> >>>> another
> >>>> (better) way to do this?
> >>>> Michael H.
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
> >
>
>
Message 19
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|
Subject: | Re: wiring the 2-50 switch |
At 11:15 PM 7/27/2007 -0400, you wrote:
><glaesers@wideopenwest.com>
>
>Frank,
>
>If you have the AeroElectric Connection manual - see page 11-18.
>
>Looking at the back of the 2-50 switch, with the keyway UP, the contact
>numbers are:
>
> 6 - 3
> 5 - 2 -- power IN to contacts 2 and 5 - each side is independent
> (4-5-6
>independent of 1-2-3)
> 4 - 1
>
>When the switch is in the DOWN position (opposite the keyway):
> - contacts 5 and 6 are connected
> - contacts 2 and 3 are connected
>
>When the switch is in the MIDDLE position:
> - contacts 5 and 6 are still connected
> - contacts 2 and 1 are connected (no power to 3)
>
>In the UP (momentary position):
> - contacts 5 and 4 are connected (no power to 6) - so the 5-4
> combination
>is the only one that is 'momentary'
> - contacts 2 and 1 are connected (no power to 3)
>
>Hope this helps.
>
>Dennis Glaeser
Also, be aware that there are two configurations for
the 2-10 switching philosophy depending on who makes the
switch. See note 15 and illustration in:
http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf
Bob . . .
Message 20
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|
Subject: | Home from OSH but still out of service for a bit |
My father's condition took a turn for the worse while
at OSH and we returned two days early. Will be heading
to Medicine Lodge, KS in a few minutes and will no doubt
be very occupied on other matters for the near term.
Bob . . .
----------------------------------------
( "Physics is like sex: sure, it may )
( give some practical results, but )
( that's not why we do it." )
( )
( Richard P. Feynman )
----------------------------------------
Message 21
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|
Subject: | Re: Vacuume pressure warning light |
This switch almost certainly works on gauge pressure, rather than
absolute pressure. Gauge pressure is the difference between the
pressure of interest and ambient pressure. The vacuum system will
have a gauge pressure of zero prior to engine start, and the vacuum
will increase to a gauge pressure of about 5" Hg once the engine is
running (i.e. the absolute pressure in the vacuum system will be 5"
Hg lower than ambient pressure). If the spec sheet values are
accurate, the contacts would remain closed unless the vacuum ever got
greater than 6" Hg, which should only happen if the regulator fails.
I don't think this switch will work for you. But, all you risk is $8
and a bit of time and energy.
Kevin Horton
On 28 Jul 2007, at 17:31, Michael Hinchcliff wrote:
> <cfi@conwaycorp.net>
>
> Hello, Ken. Since the vacuum system will always initialize at
> atmospheric pressure (29.92 Hg give or take) at each startup and
> then work it's way down to 5" Hg after startup, the switch should
> work fine according to my interpretation of the description,
> "Contact open at 6" Hg., close at 3" Hg". I interpret that the
> contactor will be disengaged (i.e. light off) while between 3-6"
> Hg, which is what I'm looking for. Please let me know if you think
> I am overlooking something here.
>
>
> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
> To: <aeroelectric-list@matronics.com>
> Sent: Saturday, July 28, 2007 3:00 PM
> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
>
>>
>> Hmmm I don't think that will work Michael. If I read this
>> correctly, it seems to me that switch will do nothing at all
>> unless it has more than 6" of vacuum applied at every startup.
>> After that then the contacts would close at shutdown or whenever
>> vacuum fell to less than 3".
>> Ken
>>
>> Michael Hinchcliff wrote:
>>
>>> <cfi@conwaycorp.net>
>>>
>>> Yes, 5 in Hg is normal. I'm going to wire this so the light
>>> illuminates when the pressure falls above the 6 inch Hg range
>>> (i.e. vac failure). If it does not work out, I'll be out just 8
>>> bucks.
>>>
>>> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
>>> To: <aeroelectric-list@matronics.com>
>>> Sent: Saturday, July 28, 2007 12:12 PM
>>> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>>>
>>>
>>>>
>>>> Does this mean that you guys are running more than 6" vacuum in
>>>> order to put the warning light out?? I had thought that 5" was
>>>> about normal??
>>>>
>>>> I'm using a solid state sensor to feed my EIS but have only set
>>>> the regulator for about 5". However sometime after a hundred
>>>> hours or so my imported horizon became somewhat erratic and
>>>> unreliable.
>>>>
>>>> Ken
>>>>
>>>> " New WASCO model 414-0005. Compact size vacuum switch. Single
>>>> pole contacts open at 6" Hg., close at 3" Hg. Factory setting
>>>> non-adjustable. Contacts rated to 5 Amps at 230 volt AC. Spade
>>>> terminals 1/4". Port 1/8" NPT. 30" Hg. max. Shpg. 1/4 lb.
>>>>
>>>> rd2@evenlink.com wrote:
>>>>
>>>>>
>>>>> Michael-
>>>>>
>>>>> This switch, along with a blinking LED, should work fine:
>>>>>
>>>>> http://www.surpluscenter.com/item.asp?
>>>>> UID 05081210041966&item=11-2344&catn
>>>>> ame
>>>>>
>>>>> The chamber is SS.
>>>>>
>>>>> The problem is, it would need a field approval for certified
>>>>> aircraft - and
>>>>> local FSDO's may not be very sympathetic to messing with the
>>>>> vac system.
>>>>> I'd like to get my hnads on such a field approval for my own
>>>>> installation.
>>>>> Anyone?
>>>>>
>>>>> Best Rumen
>>>>>
>>>>>
>>>>> _____________________Original message __________________________
>>>>> (received from Michael Hinchcliff; Date: 06:32 PM
>>>>> 7/27/2007 -0500)
>>>>> ________________________________________________________________
>>>>>
>>>>> I would like to add a vacuum pressure warning light to my
>>>>> ship's panel.
>>>>> What do you guys recommend? Is there a particular vacuum
>>>>> pressure switch
>>>>> that I can connect to my vac line that will illuminate a panel
>>>>> lamp in the
>>>>> event the vacuum pressure slides to an unsafe level - or is
>>>>> there another
>>>>> (better) way to do this?
>>>>> Michael H.
>>>>>
>>>>
>>>>
>>>>
Message 22
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|
Subject: | Re: Vacuume pressure warning light |
Please forget this post. My mind was completely somewhere else and this
description is obvious nonsense. Sorry.
Bob McC
----- Original Message -----
From: "Bob McCallum" <robert.mccallum2@sympatico.ca>
Sent: Saturday, July 28, 2007 7:01 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
<robert.mccallum2@sympatico.ca>
>
> Michael;
> The system starts out at give or take 29.92 inches of positive pressure,
> then gets "sucked" down to "zero" positive pressure by the vacuum pump,
then
> gets sucked down further until 1" of vacuum (or negative pressure) is
> created, then 2" of vacuum etc until finally you have, give or take, 5" of
> vacuum. It will, in theory, never reach 6" of vacuum unless your vacuum
> regulator fails and allows the pump to create "extra" vacuum if it's
> capable. Your switch will therefore switch on as it passes 3" of vacuum,
but
> it will be "ON" at the normal vacuum of 5", it will never reach 6" to turn
> "OFF", just the opposite of what you describe. (ON between 3 and 6, not
OFF)
>
> Bob McC
>
> ----- Original Message -----
> From: "Michael Hinchcliff" <cfi@conwaycorp.net>
> To: <aeroelectric-list@matronics.com>
> Sent: Saturday, July 28, 2007 5:31 PM
> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
>
> <cfi@conwaycorp.net>
> >
> > Hello, Ken. Since the vacuum system will always initialize at
atmospheric
> > pressure (29.92 Hg give or take) at each startup and then work it's way
> > down to 5" Hg after startup, the switch should work fine according to my
> > interpretation of the description, "Contact open at 6" Hg., close at 3"
> Hg".
> > I interpret that the contactor will be disengaged (i.e. light off) while
> > between 3-6" Hg, which is what I'm looking for. Please let me know if
you
> > think I am overlooking something here.
> >
> >
> >
> > ----- Original Message -----
> > From: "Ken" <klehman@albedo.net>
> > To: <aeroelectric-list@matronics.com>
> > Sent: Saturday, July 28, 2007 3:00 PM
> > Subject: Re: AeroElectric-List: Vacuume pressure warning light
> >
> >
> > >
> > > Hmmm I don't think that will work Michael. If I read this correctly,
it
> > > seems to me that switch will do nothing at all unless it has more than
> 6"
> > > of vacuum applied at every startup. After that then the contacts would
> > > close at shutdown or whenever vacuum fell to less than 3".
> > > Ken
> > >
> > > Michael Hinchcliff wrote:
> > >
> > >> <cfi@conwaycorp.net>
> > >>
> > >> Yes, 5 in Hg is normal. I'm going to wire this so the light
> illuminates
> > >> when the pressure falls above the 6 inch Hg range (i.e. vac failure).
> If
> > >> it does not work out, I'll be out just 8 bucks.
> > >>
> > >> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
> > >> To: <aeroelectric-list@matronics.com>
> > >> Sent: Saturday, July 28, 2007 12:12 PM
> > >> Subject: Re: AeroElectric-List: Vacuume pressure warning light
> > >>
> > >>
> > >>>
> > >>> Does this mean that you guys are running more than 6" vacuum in
order
> to
> > >>> put the warning light out?? I had thought that 5" was about normal??
> > >>>
> > >>> I'm using a solid state sensor to feed my EIS but have only set the
> > >>> regulator for about 5". However sometime after a hundred hours or so
> my
> > >>> imported horizon became somewhat erratic and unreliable.
> > >>>
> > >>> Ken
> > >>>
> > >>> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
> > >>> contacts open at 6" Hg., close at 3" Hg. Factory setting
> non-adjustable.
> > >>> Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port
> 1/8"
> > >>> NPT. 30" Hg. max. Shpg. 1/4 lb.
> > >>>
> > >>> rd2@evenlink.com wrote:
> > >>>
> > >>>>
> > >>>> Michael-
> > >>>>
> > >>>> This switch, along with a blinking LED, should work fine:
> > >>>>
> > >>>>
>
http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
> > >>>> ame
> > >>>>
> > >>>> The chamber is SS.
> > >>>>
> > >>>> The problem is, it would need a field approval for certified
> aircraft -
> > >>>> and
> > >>>> local FSDO's may not be very sympathetic to messing with the vac
> > >>>> system.
> > >>>> I'd like to get my hnads on such a field approval for my own
> > >>>> installation.
> > >>>> Anyone?
> > >>>>
> > >>>> Best Rumen
> > >>>>
> > >>>>
> > >>>> _____________________Original message __________________________
> > >>>> (received from Michael Hinchcliff; Date: 06:32 PM
> > >>>> 7/27/2007 -0500)
> > >>>> ________________________________________________________________
> > >>>>
> > >>>> I would like to add a vacuum pressure warning light to my ship's
> panel.
> > >>>> What do you guys recommend? Is there a particular vacuum pressure
> > >>>> switch
> > >>>> that I can connect to my vac line that will illuminate a panel lamp
> in
> > >>>> the
> > >>>> event the vacuum pressure slides to an unsafe level - or is there
> > >>>> another
> > >>>> (better) way to do this?
> > >>>> Michael H.
> > >>>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
>
Message 23
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Subject: | Re: Vacuume pressure warning light |
Michael
Since it is called a vacuum switch, I'm guessing it is referenced to
atmospheric and the switch points are 3" and 6" below ambient
atmospheric pressure. The 30" max vacuum in the specification tends to
confirm that to me but I could be wrong about that.
Ken
Michael Hinchcliff wrote:
> <cfi@conwaycorp.net>
>
> Hello, Ken. Since the vacuum system will always initialize at
> atmospheric pressure (29.92 Hg give or take) at each startup and then
> work it's way down to 5" Hg after startup, the switch should work fine
> according to my interpretation of the description, "Contact open at 6"
> Hg., close at 3" Hg". I interpret that the contactor will be
> disengaged (i.e. light off) while between 3-6" Hg, which is what I'm
> looking for. Please let me know if you think I am overlooking
> something here.
>
>
> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
> To: <aeroelectric-list@matronics.com>
> Sent: Saturday, July 28, 2007 3:00 PM
> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
>
>>
>> Hmmm I don't think that will work Michael. If I read this correctly,
>> it seems to me that switch will do nothing at all unless it has more
>> than 6" of vacuum applied at every startup. After that then the
>> contacts would close at shutdown or whenever vacuum fell to less than
>> 3".
>> Ken
>>
>> Michael Hinchcliff wrote:
>>
>>> <cfi@conwaycorp.net>
>>>
>>> Yes, 5 in Hg is normal. I'm going to wire this so the light
>>> illuminates when the pressure falls above the 6 inch Hg range (i.e.
>>> vac failure). If it does not work out, I'll be out just 8 bucks.
>>>
>>> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
>>> To: <aeroelectric-list@matronics.com>
>>> Sent: Saturday, July 28, 2007 12:12 PM
>>> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>>>
>>>
>>>>
>>>> Does this mean that you guys are running more than 6" vacuum in
>>>> order to put the warning light out?? I had thought that 5" was
>>>> about normal??
>>>>
>>>> I'm using a solid state sensor to feed my EIS but have only set the
>>>> regulator for about 5". However sometime after a hundred hours or
>>>> so my imported horizon became somewhat erratic and unreliable.
>>>>
>>>> Ken
>>>>
>>>> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
>>>> contacts open at 6" Hg., close at 3" Hg. Factory setting
>>>> non-adjustable. Contacts rated to 5 Amps at 230 volt AC. Spade
>>>> terminals 1/4". Port 1/8" NPT. 30" Hg. max. Shpg. 1/4 lb.
>>>>
>>>> rd2@evenlink.com wrote:
>>>>
>>>>>
>>>>> Michael-
>>>>>
>>>>> This switch, along with a blinking LED, should work fine:
>>>>>
>>>>> http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>>>>>
>>>>> ame
>>>>>
>>>>> The chamber is SS.
>>>>>
>>>>> The problem is, it would need a field approval for certified
>>>>> aircraft - and
>>>>> local FSDO's may not be very sympathetic to messing with the vac
>>>>> system.
>>>>> I'd like to get my hnads on such a field approval for my own
>>>>> installation.
>>>>> Anyone?
>>>>>
>>>>> Best Rumen
>>>>>
>>>>>
>>>>> _____________________Original message __________________________
>>>>> (received from Michael Hinchcliff; Date: 06:32 PM
>>>>> 7/27/2007 -0500)
>>>>> ________________________________________________________________
>>>>>
>>>>> I would like to add a vacuum pressure warning light to my ship's
>>>>> panel.
>>>>> What do you guys recommend? Is there a particular vacuum pressure
>>>>> switch
>>>>> that I can connect to my vac line that will illuminate a panel
>>>>> lamp in the
>>>>> event the vacuum pressure slides to an unsafe level - or is there
>>>>> another
>>>>> (better) way to do this?
>>>>> Michael H.
>>>>>
>>>>
>>>>
>>>>
>>>>
Message 24
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Subject: | Re: Very bad RFI |
I run dual DIS (distributorless) ignition with high voltage coil joiners
on my subaru with a total of 12 high voltage ignition wires. I have no
igniton noise or interference but I do run highly recommended premium
8.5mm Taylor spiral wound racing wires. I run 40 thou spark plug gap
and I think my ignition voltage is quite a bit higher than most
magnetos. The Taylor website used to explain a fair bit about ignition
wires but as I recall mine are considerably more than 150 ohms per foot.
Ken
Robert Feldtman wrote:
> I'll be interested to hear the replies on this. I am thinking about
> going to auto plugs for the same RFI reason on my LOM engine
> (Czechoslovakian) -- I'm planning on getting racing wire with 150 ohms
> per foot and shielding it with braid (you can get it from Aircraft
> spruce) and grounding only the mag end, and using heat shrink to hold
> the other end on the plug without a ground at each end (which defeats
> the shield).. Keep us advised as to what you do.
>
> bobf
>
> On 7/28/07, Dave Dugas <davedq2@yahoo.com <mailto:davedq2@yahoo.com>> wrote:
>
> Hello,
>
> I joined this list with the hope that I could try to solve my
> problem in my Q2 with a Revmaster engine. At 450 hours on the
> engine I converted to auto plugs. I changed the heads and
> replaced the aviation plug connection with auto plug connections
> supplied with the conversion. The RFI is so bad that my
> transponder reply light looks like a timing light. My Tru Trak
> auto pilot won't stay booted up, and the noise is heard on my
> com. Things I've tried are...Lonestar mag filters and eliminator
> power filter. Checking all grounds and relocating several to a
> common grounding lug. Wrapping the plug connections with tin foil
> to try to shield the interference. Checking all of the antenna
> connections. Disconnecting various radios and avionics,trying to
> isolate a particular source. Nothing worked.
>
> I used my handheld radio in the cockpit and didn't pick up any
> noise. I also called Revmaster and they is the ones who suggested
> trying the tin foil shielding.
>
> The engine is carburated and uses a Bendix 3000 series dual mag.
> Plugs are NGK resistor plugs, gapped at .016". Hopefully someone
> has a suggestion, or should I consider going back to the aviation
> setup. Is there a different harness that would work? The
> unfortunate thing is that any work that is done on the magnito
> requires that the engine is removed enough to access the mag which
> is recessed into the firewall. Thank you. Dave D.
>
>
Message 25
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Subject: | Re: Vacuume pressure warning light |
Bob, you are right. Our vacuum systems require negative 3-5" Hg of vacuum
pressure as a opposed to a mere "reduced" pressure that I was thinking of.
I confirmed this in the EA-AC-65-15A - A&P Mechanic's airframe handbook.
Hence we have VACUUM switch and not a PRESSURE switch. Thank you for the
clarification.
So, with that said, could a transistor or switch not be used to turn the
light off when the vacuum switch engages between 3-5 in Hg?
Michael
----- Original Message -----
From: "Bob McCallum" <robert.mccallum2@sympatico.ca>
Sent: Saturday, July 28, 2007 6:01 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
> <robert.mccallum2@sympatico.ca>
>
> Michael;
> The system starts out at give or take 29.92 inches of positive pressure,
> then gets "sucked" down to "zero" positive pressure by the vacuum pump,
> then
> gets sucked down further until 1" of vacuum (or negative pressure) is
> created, then 2" of vacuum etc until finally you have, give or take, 5" of
> vacuum. It will, in theory, never reach 6" of vacuum unless your vacuum
> regulator fails and allows the pump to create "extra" vacuum if it's
> capable. Your switch will therefore switch on as it passes 3" of vacuum,
> but
> it will be "ON" at the normal vacuum of 5", it will never reach 6" to turn
> "OFF", just the opposite of what you describe. (ON between 3 and 6, not
> OFF)
>
> Bob McC
>
> ----- Original Message -----
> From: "Michael Hinchcliff" <cfi@conwaycorp.net>
> To: <aeroelectric-list@matronics.com>
> Sent: Saturday, July 28, 2007 5:31 PM
> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
>
> <cfi@conwaycorp.net>
>>
>> Hello, Ken. Since the vacuum system will always initialize at atmospheric
>> pressure (29.92 Hg give or take) at each startup and then work it's way
>> down to 5" Hg after startup, the switch should work fine according to my
>> interpretation of the description, "Contact open at 6" Hg., close at 3"
> Hg".
>> I interpret that the contactor will be disengaged (i.e. light off) while
>> between 3-6" Hg, which is what I'm looking for. Please let me know if
>> you
>> think I am overlooking something here.
>>
>>
>>
>> ----- Original Message -----
>> From: "Ken" <klehman@albedo.net>
>> To: <aeroelectric-list@matronics.com>
>> Sent: Saturday, July 28, 2007 3:00 PM
>> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>>
>>
>> >
>> > Hmmm I don't think that will work Michael. If I read this correctly,
>> > it
>> > seems to me that switch will do nothing at all unless it has more than
> 6"
>> > of vacuum applied at every startup. After that then the contacts would
>> > close at shutdown or whenever vacuum fell to less than 3".
>> > Ken
>> >
>> > Michael Hinchcliff wrote:
>> >
>> >> <cfi@conwaycorp.net>
>> >>
>> >> Yes, 5 in Hg is normal. I'm going to wire this so the light
> illuminates
>> >> when the pressure falls above the 6 inch Hg range (i.e. vac failure).
> If
>> >> it does not work out, I'll be out just 8 bucks.
>> >>
>> >> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
>> >> To: <aeroelectric-list@matronics.com>
>> >> Sent: Saturday, July 28, 2007 12:12 PM
>> >> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>> >>
>> >>
>> >>>
>> >>> Does this mean that you guys are running more than 6" vacuum in order
> to
>> >>> put the warning light out?? I had thought that 5" was about normal??
>> >>>
>> >>> I'm using a solid state sensor to feed my EIS but have only set the
>> >>> regulator for about 5". However sometime after a hundred hours or so
> my
>> >>> imported horizon became somewhat erratic and unreliable.
>> >>>
>> >>> Ken
>> >>>
>> >>> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
>> >>> contacts open at 6" Hg., close at 3" Hg. Factory setting
> non-adjustable.
>> >>> Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port
> 1/8"
>> >>> NPT. 30" Hg. max. Shpg. 1/4 lb.
>> >>>
>> >>> rd2@evenlink.com wrote:
>> >>>
>> >>>>
>> >>>> Michael-
>> >>>>
>> >>>> This switch, along with a blinking LED, should work fine:
>> >>>>
>> >>>>
> http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>> >>>> ame
>> >>>>
>> >>>> The chamber is SS.
>> >>>>
>> >>>> The problem is, it would need a field approval for certified
> aircraft -
>> >>>> and
>> >>>> local FSDO's may not be very sympathetic to messing with the vac
>> >>>> system.
>> >>>> I'd like to get my hnads on such a field approval for my own
>> >>>> installation.
>> >>>> Anyone?
>> >>>>
>> >>>> Best Rumen
>> >>>>
>> >>>>
>> >>>> _____________________Original message __________________________
>> >>>> (received from Michael Hinchcliff; Date: 06:32 PM
>> >>>> 7/27/2007 -0500)
>> >>>> ________________________________________________________________
>> >>>>
>> >>>> I would like to add a vacuum pressure warning light to my ship's
> panel.
>> >>>> What do you guys recommend? Is there a particular vacuum pressure
>> >>>> switch
>> >>>> that I can connect to my vac line that will illuminate a panel lamp
> in
>> >>>> the
>> >>>> event the vacuum pressure slides to an unsafe level - or is there
>> >>>> another
>> >>>> (better) way to do this?
>> >>>> Michael H.
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>
>
>
Message 26
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Subject: | Re: Vacuume pressure warning light |
Ok, now that we're all totally confused, I'm going to go ahead and order the
$8 switch and see if/how it can be implemented. This should make for a good
educational test bed. Stay tuned.
----- Original Message -----
From: "Bob McCallum" <robert.mccallum2@sympatico.ca>
Sent: Saturday, July 28, 2007 6:55 PM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
> <robert.mccallum2@sympatico.ca>
>
> Please forget this post. My mind was completely somewhere else and this
> description is obvious nonsense. Sorry.
>
> Bob McC
>
>
> ----- Original Message -----
> From: "Bob McCallum" <robert.mccallum2@sympatico.ca>
> To: <aeroelectric-list@matronics.com>
> Sent: Saturday, July 28, 2007 7:01 PM
> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>
>
> <robert.mccallum2@sympatico.ca>
>>
>> Michael;
>> The system starts out at give or take 29.92 inches of positive pressure,
>> then gets "sucked" down to "zero" positive pressure by the vacuum pump,
> then
>> gets sucked down further until 1" of vacuum (or negative pressure) is
>> created, then 2" of vacuum etc until finally you have, give or take, 5"
>> of
>> vacuum. It will, in theory, never reach 6" of vacuum unless your vacuum
>> regulator fails and allows the pump to create "extra" vacuum if it's
>> capable. Your switch will therefore switch on as it passes 3" of vacuum,
> but
>> it will be "ON" at the normal vacuum of 5", it will never reach 6" to
>> turn
>> "OFF", just the opposite of what you describe. (ON between 3 and 6, not
> OFF)
>>
>> Bob McC
>>
>> ----- Original Message -----
>> From: "Michael Hinchcliff" <cfi@conwaycorp.net>
>> To: <aeroelectric-list@matronics.com>
>> Sent: Saturday, July 28, 2007 5:31 PM
>> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>>
>>
>> <cfi@conwaycorp.net>
>> >
>> > Hello, Ken. Since the vacuum system will always initialize at
> atmospheric
>> > pressure (29.92 Hg give or take) at each startup and then work it's
>> > way
>> > down to 5" Hg after startup, the switch should work fine according to
>> > my
>> > interpretation of the description, "Contact open at 6" Hg., close at 3"
>> Hg".
>> > I interpret that the contactor will be disengaged (i.e. light off)
>> > while
>> > between 3-6" Hg, which is what I'm looking for. Please let me know if
> you
>> > think I am overlooking something here.
>> >
>> >
>> >
>> > ----- Original Message -----
>> > From: "Ken" <klehman@albedo.net>
>> > To: <aeroelectric-list@matronics.com>
>> > Sent: Saturday, July 28, 2007 3:00 PM
>> > Subject: Re: AeroElectric-List: Vacuume pressure warning light
>> >
>> >
>> > >
>> > > Hmmm I don't think that will work Michael. If I read this correctly,
> it
>> > > seems to me that switch will do nothing at all unless it has more
>> > > than
>> 6"
>> > > of vacuum applied at every startup. After that then the contacts
>> > > would
>> > > close at shutdown or whenever vacuum fell to less than 3".
>> > > Ken
>> > >
>> > > Michael Hinchcliff wrote:
>> > >
>> > >> <cfi@conwaycorp.net>
>> > >>
>> > >> Yes, 5 in Hg is normal. I'm going to wire this so the light
>> illuminates
>> > >> when the pressure falls above the 6 inch Hg range (i.e. vac
>> > >> failure).
>> If
>> > >> it does not work out, I'll be out just 8 bucks.
>> > >>
>> > >> ----- Original Message ----- From: "Ken" <klehman@albedo.net>
>> > >> To: <aeroelectric-list@matronics.com>
>> > >> Sent: Saturday, July 28, 2007 12:12 PM
>> > >> Subject: Re: AeroElectric-List: Vacuume pressure warning light
>> > >>
>> > >>
>> > >>>
>> > >>> Does this mean that you guys are running more than 6" vacuum in
> order
>> to
>> > >>> put the warning light out?? I had thought that 5" was about
>> > >>> normal??
>> > >>>
>> > >>> I'm using a solid state sensor to feed my EIS but have only set the
>> > >>> regulator for about 5". However sometime after a hundred hours or
>> > >>> so
>> my
>> > >>> imported horizon became somewhat erratic and unreliable.
>> > >>>
>> > >>> Ken
>> > >>>
>> > >>> " New WASCO model 414-0005. Compact size vacuum switch. Single pole
>> > >>> contacts open at 6" Hg., close at 3" Hg. Factory setting
>> non-adjustable.
>> > >>> Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port
>> 1/8"
>> > >>> NPT. 30" Hg. max. Shpg. 1/4 lb.
>> > >>>
>> > >>> rd2@evenlink.com wrote:
>> > >>>
>> > >>>>
>> > >>>> Michael-
>> > >>>>
>> > >>>> This switch, along with a blinking LED, should work fine:
>> > >>>>
>> > >>>>
>>
> http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>> > >>>> ame
>> > >>>>
>> > >>>> The chamber is SS.
>> > >>>>
>> > >>>> The problem is, it would need a field approval for certified
>> aircraft -
>> > >>>> and
>> > >>>> local FSDO's may not be very sympathetic to messing with the vac
>> > >>>> system.
>> > >>>> I'd like to get my hnads on such a field approval for my own
>> > >>>> installation.
>> > >>>> Anyone?
>> > >>>>
>> > >>>> Best Rumen
>> > >>>>
>> > >>>>
>> > >>>> _____________________Original message __________________________
>> > >>>> (received from Michael Hinchcliff; Date: 06:32 PM
>> > >>>> 7/27/2007 -0500)
>> > >>>> ________________________________________________________________
>> > >>>>
>> > >>>> I would like to add a vacuum pressure warning light to my ship's
>> panel.
>> > >>>> What do you guys recommend? Is there a particular vacuum pressure
>> > >>>> switch
>> > >>>> that I can connect to my vac line that will illuminate a panel
>> > >>>> lamp
>> in
>> > >>>> the
>> > >>>> event the vacuum pressure slides to an unsafe level - or is there
>> > >>>> another
>> > >>>> (better) way to do this?
>> > >>>> Michael H.
>> > >>>>
>> > >>>
>> > >>>
>> > >>>
>> > >>>
>> > >>>
>> > >>>
>> > >>>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>>
>
>
>
Message 27
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Subject: | Vacuume pressure warning light |
At start up, the vacuum pump will pull at least 6"Hg, settling down to
around 5 as the gyros spool up. This will result in the switch passing to
"OFF", and remaining thus until the vacuum falls below 3" upon pump failure
or switch-off.
Kenneth Melvin
RV9A
Message 28
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|
Subject: | Re: DIY - In the ear headphones |
Hey Ernest. Looks like you're well along with your project!
I'm not sure what happened, but I see a post I made sometime back to the
EAA1114 list never made it out to the door. Here is a copy of it below..
--Ed
At a recent builder meeting, I had mentioned this project in the Cozy
community to Ernest. But, this can be used by everyone, not just builders...
Here are a couple of people that give instructions on how to make your own
Clarity Aloft headset clone for around $100. Maybe even approaching under $50
now if you pay attention and find deals. And when I say a clone, I mean right
down to the same Comply ear tips that are used with the Clarity Aloft.
Check it out...
Nick Ugolini (the original project)
http://www.canardzone.com/members/nickugolini/CuplessHeadet/cupless_headset.htm
Drew Chaplin (latest version by Drew)
http://www.cozy1200.com/geeklog/article.php?story 070427102533266
--Ed
--
Edward G. Savage
egs@egsavage.com
Ernest Christley wrote:
> I've been looking into building a in-the-ear type headset using low-end
> earphones, following the example given at
> http://www.canardzone.com/members/nickugolini/CuplessHeadet/cupless_headset.htm
>
>
> I bought the Phillips ANR headphones from Target. I've got Jim Weir's
> impedance matching circuit article describing how to use the audio
> transformer, so the headphone portion is in the bag.
>
> The hangup is with the microphone. I found some discussions where Jim
> said that an amplifier is needed to use an electret element. Well, I
> picked up Item# 270-090 from Radio Shack today.
> http://www.radioshack.com/product/index.jsp?summary=summary&techSpecs=techSpecs¤tTab=techSpecs&cp=&custRatings=custRatings&features=features&accessories=accessories&productId 62215&support=support&tab=summary
>
>
> It has a wiring diagram on the back of the package that seems to
> indicate that the single transistor amplifier is already built into the
> package. I was going to ask if that was in fact what it indicates, and
> inquire whether it would work with the RST-443 intercom. Then I got
> antsy and just went and tried it. With only two leads, you know I had
> to hook it up backwards and feel disappointed for a minute until I
> figured out to turn the leads around. Then it was "WOOHOO!!" all the way.
>
> I'm now well on my way to having the equivalent of a $500, in-the-ear
> headset, and it's only costing me about $50. (Testing is incomplete,
> but others have reported resounding success.)
> This list provided courtesy of Safe Data, Inc.
> To leave send an email to eaa1114-request@safedataisp.net with the
> Keyword LEAVE in the body.
>
Message 29
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|
Subject: | Re: Vacuume pressure warning light |
I have installed this pressure/vacuum switch in my Lancair. I connected an LED
indicator light. Works great in the SUMMER. In the WINTER, the vacuum pump
doesn't pull enough vacuum on startup(cold), to open the contacts which causes
the LED to stay lighted. Sometimes, the light will go out during flight. On
warm starts in the winter, the light usually goes out. I connected the switch
to the gauge port on one of the vacuum instruments. Maybe another location
would yield better results.
Mike Salzman
Fairfield, CA
LNCE
----- Original Message ----
From: Ken <klehman@albedo.net>
Sent: Saturday, July 28, 2007 10:12:45 AM
Subject: Re: AeroElectric-List: Vacuume pressure warning light
Does this mean that you guys are running more than 6" vacuum in order to
put the warning light out?? I had thought that 5" was about normal??
I'm using a solid state sensor to feed my EIS but have only set the
regulator for about 5". However sometime after a hundred hours or so my
imported horizon became somewhat erratic and unreliable.
Ken
" New WASCO model 414-0005. Compact size vacuum switch. Single pole
contacts open at 6" Hg., close at 3" Hg. Factory setting non-adjustable.
Contacts rated to 5 Amps at 230 volt AC. Spade terminals 1/4". Port 1/8"
NPT. 30" Hg. max. Shpg. 1/4 lb.
rd2@evenlink.com wrote:
>
>Michael-
>
>This switch, along with a blinking LED, should work fine:
>
>http://www.surpluscenter.com/item.asp?UID 05081210041966&item=11-2344&catn
>ame
>
>The chamber is SS.
>
>The problem is, it would need a field approval for certified aircraft - and
>local FSDO's may not be very sympathetic to messing with the vac system.
>I'd like to get my hnads on such a field approval for my own installation.
>Anyone?
>
>Best
>Rumen
>
>
>_____________________Original message __________________________
> (received from Michael Hinchcliff; Date: 06:32 PM
>7/27/2007 -0500)
>________________________________________________________________
>
>I would like to add a vacuum pressure warning light to my ship's panel.
>What do you guys recommend? Is there a particular vacuum pressure switch
>that I can connect to my vac line that will illuminate a panel lamp in the
>event the vacuum pressure slides to an unsafe level - or is there another
>(better) way to do this?
>
>Michael H.
>
>
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