Today's Message Index:
----------------------
1. 11:48 AM - Re: How do you hold a pull able breaker opened (rparigor@SUFFOLK.LIB.NY.US)
2. 12:33 PM - Re: Fw: Re: Ignition Switch - VAF Thread (Bill Schlatterer)
3. 05:33 PM - Re: Fw: Re: Ignition Switch - VAF Thread (Henry Trzeciakowski)
4. 06:50 PM - Re: Fw: Re: Ignition Switch - VAF Thread (Robert L. Nuckolls, III)
5. 06:52 PM - Re: How do you hold a pull able breaker opened (jetboy)
6. 06:58 PM - DIY LED fixture data (Robert L. Nuckolls, III)
7. 09:26 PM - AEC 9051 Filtered LED Driver Circuit Question (Daniel Langhout)
Message 1
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| Subject: | Re: How do you hold a pull able breaker opened |
Hi Bob
"> What is the diameter of the cb button under
the
> head? What is the gap (thickness of the clip)?>"
The shaft sticking out of P+B pullable breaker has three tiers.
Head is .312" diameter and .115" in length, and second
tier below head is .250" in diameter and .200" in length, and
third tier is .200" in diameter and .200"in length.
Thus total shaft length sticking out measured from metal threaded
portion to tipof head when pulled is .515" (.115" +
.200" + .200"), with their threerespective diameters (head
being the largest) .312", .250", .200".
Ron Parigoris
Message 2
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| Subject: | Re: Ignition Switch - VAF Thread |
This thread pretty much covers it all on the starter switch and ground.
Short story is that the GRD terminal on the 504 switch uses the shield on
the P-Lead to get to the aircraft ground. Read this, should cover it for
you.
http://www.vansairforce.com/community/showthread.php?t=36272
<http://www.vansairforce.com/community/showthread.php?t=36272&highlight=Star
ter+Switch> &highlight=Starter+Switch
Hope this helps.
Bill S
7a finishing
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Saturday, December 20, 2008 1:00 PM
Subject: Re: Fw: AeroElectric-List: Re: Ignition Switch
At 11:41 PM 12/19/2008, you wrote:
----- Original Message -----
From: Henry <mailto:hammer408@comcast.net> Trzeciakowski
Sent: Thursday, December 18, 2008 7:09 PM
Subject: AeroElectric-List: Re: Ignition Switch
Bob:
I just purchased an ACS Ignition Switch (A-510-2) [
Off-Right-Left-Both-Start] and was looking at their wiring instructions. I
then downloaded your Z-26 diagram for Ignition Switch Options - Magento.
Both wiring diagrams are basically identical with a few differences:
Both diagrams jumper GRD &R for impulse coupling to Right Mag - shielded
wire
Both depict L to Left Mag - shielded wire
Both depict B to Main Bus (7amp)
Both diagram S to Starter Seleniod
The differences are:
ACS has shielded wire grounded at the right & left mag only, and the GRD
terminal grounded at the grounding block or nearest structure.
whereas your Z-26 have these wires shielded at both ends with the shield
closest to the ignition switch wired to the GRD, but your GRD is NOT
grounded to a grounding block or nearest structure....
ACS also says to use all shielded wire....I personally think that is
overkill...
So, would you recommend grounding at both ends of the shielding wire, but
why not ground at the switch, or was this accidently omitted by you?
Comments, suggestions appreciated.
Yes, there are differences. I hope
you will forgive me . . . I'm not trying
to be obtuse but I just don't have the
time at the moment to explain them. They've
been discussed here on the List and you can
probably find the exchanges in the matronics
archives.
It's a noise and ground loops issue.
Bob . . .
Message 3
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| Subject: | Re: Ignition Switch - VAF Thread |
Thanks Bill:
This definitely answers my question.......I can now see the "light"
regarding grounding the sheilded wire at both ends per Bob's
Z-26......the link to the 2005 VAF Forum was excellent. The one thng I
noticed was that they are using 18awg shieded and Bob's Z-26 uses 20 awg
shielded....20 is what I have and plan on using unless 18 is better than
20 !!
Thanks again
Henry
----- Original Message -----
From: Bill Schlatterer
To: aeroelectric-list@matronics.com
Sent: Sunday, December 21, 2008 12:31 PM
Subject: RE: Fw: AeroElectric-List: Re: Ignition Switch - VAF Thread
This thread pretty much covers it all on the starter switch and
ground. Short story is that the GRD terminal on the 504 switch uses the
shield on the P-Lead to get to the aircraft ground. Read this, should
cover it for you.
http://www.vansairforce.com/community/showthread.php?t=36272&highlight=
Starter+Switch
Hope this helps.
Bill S
7a finishing
-------------------------------------------------------------------------
-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Saturday, December 20, 2008 1:00 PM
To: aeroelectric-list@matronics.com
Subject: Re: Fw: AeroElectric-List: Re: Ignition Switch
At 11:41 PM 12/19/2008, you wrote:
----- Original Message -----
From: Henry Trzeciakowski
To: aeroelectric-list@matronics.com
Sent: Thursday, December 18, 2008 7:09 PM
Subject: AeroElectric-List: Re: Ignition Switch
Bob:
I just purchased an ACS Ignition Switch (A-510-2) [
Off-Right-Left-Both-Start] and was looking at their wiring instructions.
I then downloaded your Z-26 diagram for Ignition Switch Options -
Magento. Both wiring diagrams are basically identical with a few
differences:
Both diagrams jumper GRD &R for impulse coupling to Right Mag -
shielded wire
Both depict L to Left Mag - shielded wire
Both depict B to Main Bus (7amp)
Both diagram S to Starter Seleniod
The differences are:
ACS has shielded wire grounded at the right & left mag only, and the
GRD terminal grounded at the grounding block or nearest structure.
whereas your Z-26 have these wires shielded at both ends with the
shield closest to the ignition switch wired to the GRD, but your GRD is
NOT grounded to a grounding block or nearest structure....
ACS also says to use all shielded wire....I personally think that is
overkill...
So, would you recommend grounding at both ends of the shielding
wire, but why not ground at the switch, or was this accidently omitted
by you?
Comments, suggestions appreciated.
Yes, there are differences. I hope
you will forgive me . . . I'm not trying
to be obtuse but I just don't have the
time at the moment to explain them. They've
been discussed here on the List and you can
probably find the exchanges in the matronics
archives.
It's a noise and ground loops issue.
Bob . . .
href="http://www.matronics.com/contribution">http://www.matronics.com/c
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
Message 4
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| Subject: | Re: Ignition Switch - VAF Thread |
At 08:08 PM 12/21/2008, you wrote:
>Thanks Bill:
>
>This definitely answers my question.......I can now see the "light"
>regarding grounding the sheilded wire at both ends per Bob's
>Z-26......the link to the 2005 VAF Forum was excellent. The one
>thng I noticed was that they are using 18awg shieded and Bob's Z-26
>uses 20 awg shielded....20 is what I have and plan on using unless
>18 is better than 20 !!
>
>Thanks again
Some TC aircraft designs specify 20AWG or larger to
any accessories on the engine . . . it's some sort
of robustness thing. I suppose 18AWG is more robust
still. On canard pushers, there IS a voltage drop issue
for the long run from start switch to the tail mounted
starter contactor combined with low battery and cold
temperatures. 20AWG is fine but if you have some scraps
of 18 laying around waiting for useful duty on your
airplane it would be fine too. The only wires that benefit
from shielding are the p-leads and then only if wired
as depicted in the z-figures. There again 20 is adequate
but 18 is fine if you have it.
Bob . . .
Message 5
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| Subject: | Re: How do you hold a pull able breaker opened |
Probably a bit OTT have you looked at fitting a 'missile switch' cover MS25224-1
looks close enough to accomadate .5" of breaker shaft if you drill out the
cover for clearance in the protected position.
Perhaps a nicer way would be to recess the breaker so when pulled the button is
level with the others.
Ralph
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220474#220474
Message 6
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| Subject: | DIY LED fixture data |
A number of folks have sent me links to websites that either
offer led lighting products or suppliers of individual LEDs
that you may find suited to your task. Here's the list
I have cmplied to date:
http://www.firststarled.com/
http://www.duckworksmagazine.com/06/columns/guest/james.htm
http://www.creativair.com/combo-navigation-light-kits-p-88.html
http://www.amtonline.com/publication/article.jsp?pubId=1&id=1585
http://jmhledaircraftlights.blogspot.com/
http://www.eaa724.org/TechnicalStuff%20.html
http://www.creativair.com/
http://www.killacycle.com/Lights.htm
http://gsair.com/
http://www.luxeonstar.com/
http://www.periheliondesign.com/ledlights.htm
http://www.vansairforce.com/community/showthread.php?t=24258
http://www.experimentalaircraft.info/articles/aircraft-lights-redbeacon.php
http://stores.ebay.com/Light-of-Victory-Led-Store-lvehk
http://stores.ebay.com/Emili223-Store
http://stores.ebay.com.hk/auspiciouse
http://stores.ebay.com/led-hk
http://stores.ebay.com/cece718
http://stores.ebay.com.hk/electronicsdiy
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 7
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| Subject: | AEC 9051 Filtered LED Driver Circuit Question |
This is probably a question for Bob . . . .
I am in the process of building an LED driver that has 4 of the
3021-D-E-1000 Buck Pucks on the same board. I am attempting to parrot
the filter design that Bob used for the AEC 9051 to quiet down the Buck
Pucks but I have a couple of questions:
1. This board will use PWM (100 Hz) from a PIC to control the
intensity of the LEDs attached to it. The Buck Pucks can be "flashed"
at up to 10 kHz by toggling the control pin between 0 and 5V. I have
tested this at 100 Hz and they work very well this way "bare". If I add
the the filter network a-la the AEC 9051 to the LED+ and LED- lines,
will it detrimentally affect the ability to toggle the output of the
Buck Puck on and off at 100 Hz? I suspect that it won't but I'd like a
second (more informed) opinion.
2. Each of the 4 Buck Pucks will have to have it's own filter network
on LED+ and LED-. But I would really like to avoid having to replicate
the filters 4 times for the VIN+ and VIN- lines. If I combined these
into a single filter, would I need to change the inductance and
capacitance values of the components? Inductance and capacitance values
aside, it would seem that I would now have to have an inductor rated
for at least 4A to feed the 4 Buck Pucks. Does that sound right? The
problem there is that a 100uH inductor rated for 4A is physically pretty
large and I'm really trying to keep the size of this thing down. Any
other suggested solutions?
Thanks!
Dan Langhout
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