Today's Message Index:
----------------------
1. 03:20 AM - Re: Bob Nuckolls Seminar (BobsV35B@aol.com)
2. 07:44 AM - Heated pitot tube electrical connector (Ralph E. Capen)
3. 08:26 AM - Re: Bob Nuckolls Seminar (John Burnaby)
4. 09:15 AM - Re: Grimes P/N 5530 retractable landing light (Robert L. Nuckolls, III)
5. 09:31 AM - Re: Noise on the Com (Robert L. Nuckolls, III)
6. 09:32 AM - Re: Grimes P/N 5530 retractable landing light (Robert L. Nuckolls, III)
7. 09:35 AM - Re: Grimes P/N 5530 retractable landing light (Bruce Gray)
8. 09:41 AM - Re: Bob Nuckolls Seminar (Robert L. Nuckolls, III)
9. 10:50 AM - Re: Grimes P/N 5530 retractable landing light (Steve Thomas)
10. 12:13 PM - Re: Grimes P/N 5530 retractable landing light (Steve Thomas)
11. 03:50 PM - wig wag HID lights (Dave Leikam)
12. 04:07 PM - Re: wig wag HID lights (William Slaughter)
13. 04:24 PM - Re: wig wag HID lights (Alan Adamson)
14. 04:29 PM - Re: wig wag HID lights (Alan Adamson)
15. 04:56 PM - Isolated DC-DC Electronics design pointers (Carl Morgan)
16. 05:13 PM - Re: Isolated DC-DC Electronics design pointers (Alan Adamson)
17. 06:01 PM - Isolated DC-DC Electronics design pointers (Ralph Hoover)
18. 06:13 PM - Re: Isolated DC-DC Electronics design pointers (Carl Morgan)
19. 06:43 PM - Re: Isolated DC-DC Electronics design pointers (Joe Garner)
20. 07:22 PM - Re: Isolated DC-DC Electronics design pointers (Richard E. Tasker)
21. 07:47 PM - Re: wig wag HID lights (Dave Leikam)
22. 07:55 PM - Dropping Voltage to 5V from 12V (Mark Cupitt)
23. 08:13 PM - Re: wig wag HID lights (Alan Adamson)
24. 08:16 PM - Re: Dropping Voltage to 5V from 12V (Alan Adamson)
25. 09:34 PM - Re: wig wag HID lights (Dave Leikam)
26. 10:29 PM - Re: Dropping Voltage to 5V from 12V (Tim Olson)
27. 11:35 PM - Amp sensing with hall effect (Jekyll)
28. 11:37 PM - Re: Dropping Voltage to 5V from 12V (John Coloccia)
Message 1
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Subject: | Re: Bob Nuckolls Seminar |
Good Morning All,
I was also able to attend the West Bend seminar.
Matt asks that we not just post "Me Too!" messages, but Dave has stated it
so well that all I can do is agree.
Well worth the $time$ and dollars spent.
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 6/3/2007 11:16:12 P.M. Central Daylight Time,
DAVELEIKAM@wi.rr.com writes:
I just finished a weekend Aeroelectric seminar with Bob Nuckolls at EAA
chapter 1158 in West Bend, WI. I can't say enough about this experience. Bob's
presentation and class were outstanding. Bob is the kind of guy you would
like to sit with for hours picking his brain. His knowledge and experience
with aviation electronics is vast. I recommend this class to anyone able to
attend. I came away with much more confidence that I would be able to dive
into my electrical system and do a good job. He cleared up many myths and
misconceptions about aircraft wiring methods and backed up all his ideas very
clearly. All his methods are centered on safety, simplicity and also cost
saving! I was surprised at how many things I thought I should have in my system
that Bob showed us are not needed or could be done much simpler and for less
money and safer too! It is obvious that he really loves to pass on all the
experience he has gained and he is very good at it. Thanks Bob for a great
Seminar!
Oh yeah, Chapter 1158 has a beautiful facility and were great hosts for this
event. Thanks EAA 1158!
Dave Leikam
RV-10 40496
Muskego, WI
************************************** See what's free at http://www.aol.com.
Message 2
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Subject: | Heated pitot tube electrical connector |
Folks,
I am looking for a replacement connector for my AN5814 heated pitot/static tube.
The connector has a part number of AN3115-1.
Any help would be appreciated,
Ralph Capen
Message 3
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Subject: | Re: Bob Nuckolls Seminar |
Preaching to the choir, but I understand....you just gotta tell somebody
about this phenomenal living resource!
Message 4
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Subject: | Re: Grimes P/N 5530 retractable landing light |
At 03:30 PM 6/1/2007 -0700, you wrote:
>Does anybody know if they made these in a 12v version?
>
>
>> and a Grimes P/N 5530
>> >Retractable Landing Light which I would like to install.
>> >
There are a number of 12 and 24 volt, retractable landing lights
out there in the wild. Of course, they've not been installed in
a production aircraft for many moons. A C-120.5 I used to fly
had one on it as did many other Cessnas of the 40's and 50's I
had the pleasure to ride in and/or touch.
I've always thought that a modern incarnation of this product
was worthy of consideration. The devices mount on the underside
of the wing (less prone to leaking due to rain in both parked
and flying conditions), easier to install, easier to design for
adjustability (pointing) and offers a degree of in-flight
adjustability for optimum illumination in a steep approach but
can be lowered to optimize illumination for taxi.
If you find a 24v device you'd like to use, just put a 14v lamp
in it and run the motor on half voltage. It will still work, just
slower. A group of folks I'm working with these days are really into
small, modern actuators . . . we might come up with a retractable
light assembly designed around a modern, automotive halogen or
even an LED light bulb.
Bob . . .
Message 5
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Subject: | Re: Noise on the Com |
At 07:23 PM 6/1/2007 -0400, you wrote:
>
>I am chasing noise on my Garmin 430.
>
>It is a clicking noise (like spark plugs) that I am picking up on the
>antennae lead of my 430. The frequency changes with engine RPM. I have
>two antennas - one in each winglet of my Velocity. Swapping antennas
>makes no difference.
>
>Disconnect the antenna from the radio and the noise goes away. Turn off
>my Jeff Rose Electroair and the noise goes away. I have installed new
>spark plugs and new ignition wires, still have the noise. Interestingly,
>the #2 COM, a Microair 760 does not have this noise.
>
>I have checked grounds on my ignition system and on the 430, no problems
>found.
>
>I'm thinking of making a small antenna to connect to the 430 and use it as
>a wand to locate the source. Any other ideas on locating the source?
The sniffer probe is a good idea. See if you can
hear the noise on a hand held. Use headphones so
that you minimize environmental noises. Use handy
length of coax and probes like
http://www.aeroelectric.com/Pictures/Tools/Sniffer_Probes.jpg
to poke around the wires and black boxes.
Try running the ignition system off of it's own battery.
Get a couple of 6v lantern batteries to hook in series
as a test supply. It's just possible that the noise is
coming out of the power supply leads and being radiated
by ship's wiring such that the radio hears it.
Bob . . .
Message 6
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Subject: | Re: Grimes P/N 5530 retractable landing light |
At 06:36 PM 6/1/2007 -0400, you wrote:
>In a message dated 6/1/2007 5:33:58 P.M. Central Daylight Time,
>blackoaks@gmail.com writes:
>Does anybody know if they made these in a 12v version?
>
>
> and a Grimes P/N 5530
> >Retractable Landing Light which I would like to install.
> >
>
>
>--
>John McMahon
>Lancair Super ES, S/N 170, N9637M (Reserved)
>
>Good Evening John,
>
>Supposedly, mine is a twelve volt version. However, I have not yet put
>power to it!
>
Bob, Consider acquiring a current limited, adjustable power supply
like this:
http://tinyurl.com/3yrvaq
You can set this puppy up for 14v output and turn the
current limit down to 1A or so and safely probe the pins
of the device to see which ones cause the motor to move and
which way. The lamp will be connected to it's own pins and
this little power supply will simply stall into a perceived
dead short when you find those pins.
One pin will be common to the motor and two other pins
will be extend and retract. I'll bet that the motor stuff
all happens on A, B and C while the lamp pins will be somewhere
else in the constellation.
Alternatively to the power supply, rig a test setup with
a battery, and put some 1-2A light bulb in series with
the leads to the test probes. Shorting the probes will
produce a limited current flow. You can parallel a number
of small lamps to get the 1-2A rating . . . back-up lamps
for cars are hot prospects.
Bob . . .
----------------------------------------
( "Physics is like sex: sure, it may )
( give some practical results, but )
( that's not why we do it." )
( )
( Richard P. Feynman )
----------------------------------------
Message 7
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Subject: | Grimes P/N 5530 retractable landing light |
I'll take 2, 24v, please consider HID lights.
Bruce
www.glasair.org
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Monday, June 04, 2007 1:15 PM
Subject: Re: AeroElectric-List: Grimes P/N 5530 retractable landing light
<nuckollsr@cox.net>
If you find a 24v device you'd like to use, just put a 14v lamp
in it and run the motor on half voltage. It will still work, just
slower. A group of folks I'm working with these days are really into
small, modern actuators . . . we might come up with a retractable
light assembly designed around a modern, automotive halogen or
even an LED light bulb.
Bob . . .
Message 8
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Subject: | Re: Bob Nuckolls Seminar |
At 11:12 PM 6/3/2007 -0600, you wrote:
>I just finished a weekend Aeroelectric seminar with Bob Nuckolls at EAA
>chapter 1158 in West Bend, WI. I can't say enough about this
>experience. Bob's presentation and class were outstanding. Bob is the
>kind of guy you would like to sit with for hours picking his brain. His
>knowledge and experience with aviation electronics is vast. I recommend
>this class to anyone able to attend. I came away with much more
>confidence that I would be able to dive into my electrical system and do a
>good job. He cleared up many myths and misconceptions about aircraft
>wiring methods and backed up all his ideas very clearly. All his methods
>are centered on safety, simplicity and also cost saving! I was surprised
>at how many things I thought I should have in my system that Bob showed us
>are not needed or could be done much simpler and for less money and safer
>too! It is obvious that he really loves to pass on all the experience he
>has gained and he is very good at it. Thanks Bob for a great Seminar!
>
Thank you my friend for those kind words . . . and validating
our mission for offering these programs.
>Oh yeah, Chapter 1158 has a beautiful facility and were great hosts for
>this event. Thanks EAA 1158!
You got that right. I'm going to cultivate and ongoing
relationship with this forward looking, very energetic
chapter with an educational mission.
Bob . . .
Message 9
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Subject: | Re: Grimes P/N 5530 retractable landing light |
I'll take two too, 12 v., HID
Best Regards,
Steve
____________________________________________________________________
On Jun 4, 2007, at 9:35 AM, Bruce Gray wrote:
> <Bruce@glasair.org>
>
> I'll take 2, 24v, please consider HID lights.
>
> Bruce
> www.glasair.org
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
> Robert L.
> Nuckolls, III
> Sent: Monday, June 04, 2007 1:15 PM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Grimes P/N 5530 retractable landing
> light
>
>
> <nuckollsr@cox.net>
>
> If you find a 24v device you'd like to use, just put a 14v lamp
> in it and run the motor on half voltage. It will still work, just
> slower. A group of folks I'm working with these days are really into
> small, modern actuators . . . we might come up with a retractable
> light assembly designed around a modern, automotive halogen or
> even an LED light bulb.
>
> Bob . . .
>
>
Message 10
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Subject: | Re: Grimes P/N 5530 retractable landing light |
I was snooping around the net for a retractable light system and
found the following statement on the XeVision site:
"We also have oval and rectangular designs for small spaces (wing-
tip) and a retractable landing light system (under design)."
It's on the aviation page of their site, xevision.com.
Best Regards,
Steve T
____________________________________________________________________
On Jun 4, 2007, at 10:15 AM, Robert L. Nuckolls, III wrote:
> we might come up with a retractable
> light assembly designed around a modern, automotive halogen or
> even an LED light bulb.
>
> Bob . . .
Message 11
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Subject: | wig wag HID lights |
I was told I cannot wig wag the HID lights I purchased from CreativeAir.
True or False???
Dave Leikam
RV-10 40496
QB Wings
Message 12
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Subject: | wig wag HID lights |
True. HID lights cannot turn on and off quickly.
William Slaughter
RV-8 Fuselage
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 6:50 PM
Subject: AeroElectric-List: wig wag HID lights
I was told I cannot wig wag the HID lights I purchased from CreativeAir.
True or False???
Dave Leikam
RV-10 40496
QB Wings
Message 13
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Subject: | wig wag HID lights |
CreativAir sells an HID wigwagger, whey don't you ask them?
Alan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 7:50 PM
Subject: AeroElectric-List: wig wag HID lights
I was told I cannot wig wag the HID lights I purchased from CreativeAir.
True or False???
Dave Leikam
RV-10 40496
QB Wings
Message 14
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Subject: | wig wag HID lights |
Um, hate to argue, but don't think that is true...
See - http://www.creativair.com/wigwag-flasher-halogen-lamps-p-89.html
plus I know others who routinely wigwag HID's.
Alan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of William
Slaughter
Sent: Monday, June 04, 2007 7:07 PM
Subject: RE: AeroElectric-List: wig wag HID lights
True. HID lights cannot turn on and off quickly.
William Slaughter
RV-8 Fuselage
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 6:50 PM
Subject: AeroElectric-List: wig wag HID lights
I was told I cannot wig wag the HID lights I purchased from CreativeAir.
True or False???
Dave Leikam
RV-10 40496
QB Wings
http://www.matronics.com/Navigator?AeroElectric-List
http://forums.matronics.com
Message 15
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Subject: | Isolated DC-DC Electronics design pointers |
Hi,
I would like to fabricate a small PCB to provide an isolated (or two
isolated) 9V DC supplies (< 250mA each) from the ship 12/14V feed.
I'm happy with designing the PCBs layout / fabrication etc from a schematic
but have been struggling to find a simple solution. My gut feeling is there
should be a IC out there that does this for me with a few additional
external components - any suggestions?
Thanks,
Carl
--
ZK-VII - RV 7A QB - finishing? - New Zealand
http://www.rvproject.gen.nz/
Message 16
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Subject: | Isolated DC-DC Electronics design pointers |
Don't they make 7809's? A single part, maybe need a cap or resistor to
current limit it, but pretty sure they are avail. Look for LM7809 as a
start, probably all kinds of versions.
Alan
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Carl
Morgan
Sent: Monday, June 04, 2007 7:53 PM
Subject: AeroElectric-List: Isolated DC-DC Electronics design pointers
--> <zk-vii@rvproject.gen.nz>
Hi,
I would like to fabricate a small PCB to provide an isolated (or two
isolated) 9V DC supplies (< 250mA each) from the ship 12/14V feed.
I'm happy with designing the PCBs layout / fabrication etc from a schematic
but have been struggling to find a simple solution. My gut feeling is there
should be a IC out there that does this for me with a few additional
external components - any suggestions?
Thanks,
Carl
--
ZK-VII - RV 7A QB - finishing? - New Zealand http://www.rvproject.gen.nz/
Message 17
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Subject: | Isolated DC-DC Electronics design pointers |
Carl,
Try this NDY1209C A couple of capacitors and you have an isolated
supply. I have a couple of the 200ma (NDL1209SC) versions for my ANR
power but I have not yet tested everything although the power supplies
are working fine. I wired them on a piece of perf board.
Purchased from: www.mouser.com
C&D Web site: http://store.cd4power.com
C&D Technologies, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151, USA
Tel: + (508) 339-3000
Fax: +(800) 233-2765
email: sales@cdtechno.com
--
Ralph C. Hoover
RV7A
hooverra at verizon dot net
Message 18
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Subject: | Isolated DC-DC Electronics design pointers |
My (limited) understanding is these are similar to the LM315 / 350 type
devices - 3 legged and don't use an isolated ground.
Cheers,
Carl
> -----Original Message-----
> From: Alan Adamson [mailto:aadamson@highrf.com]
> Sent: Tuesday, 5 June 2007 12:12 p.m.
> To: aeroelectric-list@matronics.com
> Subject: RE: AeroElectric-List: Isolated DC-DC Electronics design pointers
>
>
> <aadamson@highrf.com>
>
> Don't they make 7809's? A single part, maybe need a cap or resistor to
> current limit it, but pretty sure they are avail. Look for LM7809 as a
> start, probably all kinds of versions.
>
> Alan
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Carl
> Morgan
> Sent: Monday, June 04, 2007 7:53 PM
> To: AeroElectric List
> Subject: AeroElectric-List: Isolated DC-DC Electronics design pointers
>
> --> <zk-vii@rvproject.gen.nz>
>
> Hi,
>
> I would like to fabricate a small PCB to provide an isolated (or two
> isolated) 9V DC supplies (< 250mA each) from the ship 12/14V feed.
>
> I'm happy with designing the PCBs layout / fabrication etc from a
> schematic
> but have been struggling to find a simple solution. My gut
> feeling is there
> should be a IC out there that does this for me with a few additional
> external components - any suggestions?
>
> Thanks,
>
> Carl
> --
> ZK-VII - RV 7A QB - finishing? - New Zealand http://www.rvproject.gen.nz/
>
>
> 4/06/2007 6:43 p.m.
>
Message 19
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Subject: | Re: Isolated DC-DC Electronics design pointers |
Hard to beat one or two of these at ~$13 ea...
Dont know if you can get them in NZ though?
HTH, Joe
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=184688&Row=24103&Site=US
Carl Morgan wrote:
>
> Hi,
>
> I would like to fabricate a small PCB to provide an isolated (or two
> isolated) 9V DC supplies (< 250mA each) from the ship 12/14V feed.
>
> I'm happy with designing the PCBs layout / fabrication etc from a schematic
> but have been struggling to find a simple solution. My gut feeling is there
> should be a IC out there that does this for me with a few additional
> external components - any suggestions?
>
> Thanks,
>
> Carl
> --
> ZK-VII - RV 7A QB - finishing? - New Zealand
> http://www.rvproject.gen.nz/
>
>
Message 20
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Subject: | Re: Isolated DC-DC Electronics design pointers |
Do you actually need isolated 9V? If so, then the solution suggested by
Mr. Hoover should be okay. But note carefully that those devices have a
minimum load (25% or 83mA for the one in question). Specifically what
happens under that load is not specified, but they do say that the
ripple increases significantly. Maybe Mr. Hoover can tell us what
happens at very low or no loads as he has some of these units (assuming
he has access to an oscilloscope).
If you do not need isolation, then the other suggestion of using a 7809
is a good one. This part needs only a small input and a small output
capacitor (similar to the NDY1209C but can use a lower quality cap).
They are available from many manufacturers and are very cheap. The
NDY1209C specifies 78% efficiency at full load which is not bad but
probably falls at lighter loads. The 7809 will run at 63% efficiency
for all loads (14.2V in and 9V out). While the difference between 78%
and 63% may seem like a lot to some, and for high power applications it
would be, for this application the difference is only 1/2W. You might
need a small heat sink on the 7809 depending on what your actual load is.
Dick Tasker
Carl Morgan wrote:
>
>Hi,
>
>I would like to fabricate a small PCB to provide an isolated (or two
>isolated) 9V DC supplies (< 250mA each) from the ship 12/14V feed.
>
>I'm happy with designing the PCBs layout / fabrication etc from a schematic
>but have been struggling to find a simple solution. My gut feeling is there
>should be a IC out there that does this for me with a few additional
>external components - any suggestions?
>
>Thanks,
>
>Carl
>--
>ZK-VII - RV 7A QB - finishing? - New Zealand
>http://www.rvproject.gen.nz/
>
>
>
>
--
Please Note:
No trees were destroyed in the sending of this message. We do concede, however,
that a significant number of electrons may have been temporarily inconvenienced.
--
Message 21
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Subject: | Re: wig wag HID lights |
I did. Thanks!
Dave Leikam
----- Original Message -----
From: Alan Adamson
To: aeroelectric-list@matronics.com
Sent: Monday, June 04, 2007 5:21 PM
Subject: RE: AeroElectric-List: wig wag HID lights
CreativAir sells an HID wigwagger, whey don't you ask them?
Alan
-------------------------------------------------------------------------
-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 7:50 PM
To: aeroelectric-list@matronics.com
Subject: AeroElectric-List: wig wag HID lights
I was told I cannot wig wag the HID lights I purchased from
CreativeAir. True or False???
Dave Leikam
RV-10 40496
QB Wings
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 22
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Subject: | Dropping Voltage to 5V from 12V |
Hi There Folks
I need to supply a small device in the cockpit with 5V from a 12V aircraft
supply. One way to do this is with a transformer I would guess. Is there a
way to do it with resistors. The current requirement is 200-300 milliamps.
Appreciate any suggestions and recommendations
Regards
Mark Cupitt
RP-C883
Philippines
Message 23
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Subject: | wig wag HID lights |
Bizarre Dave... Not trying to poke at you.. Seriously, they have a device on
their website that is used to wig-wag HID's. I talked them them numerous
times while they were in search for the 2" versions that they have and they
said they were flashable. I know people who have used a simple timer
circuit to flash them too....
Ah, well as an old boss of mine use to say.... "I guess the truth changed".
Sorry, done correctly (with a warm up time), they should be able to be
flashed. Even XeVsion sells a flasher for theirs.
Alan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 11:46 PM
Subject: Re: AeroElectric-List: wig wag HID lights
I did. Thanks!
Dave Leikam
----- Original Message -----
From: Alan <mailto:aadamson@highrf.com> Adamson
Sent: Monday, June 04, 2007 5:21 PM
Subject: RE: AeroElectric-List: wig wag HID lights
CreativAir sells an HID wigwagger, whey don't you ask them?
Alan
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 7:50 PM
Subject: AeroElectric-List: wig wag HID lights
I was told I cannot wig wag the HID lights I purchased from CreativeAir.
True or False???
Dave Leikam
RV-10 40496
QB Wings
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
Message 24
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Subject: | Dropping Voltage to 5V from 12V |
Boy we are onto this topic tonight aren't we... Let's see for 5v it's a
7805, for 9v it's a 7809, to get to 12v from higher, it's a 7812. They even
make a 7810 for 10v... Negative voltage versions are 79xx :)
Try LM7805 with a small number of additional components. All the major
mailorder places carry them, but can't tell you where to go in the
Philippines.
Alan
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Mark
Cupitt
Sent: Monday, June 04, 2007 10:50 PM
Subject: AeroElectric-List: Dropping Voltage to 5V from 12V
--> <mark@metalcrafters.ph>
Hi There Folks
I need to supply a small device in the cockpit with 5V from a 12V aircraft
supply. One way to do this is with a transformer I would guess. Is there a
way to do it with resistors. The current requirement is 200-300 milliamps.
Appreciate any suggestions and recommendations
Regards
Mark Cupitt
RP-C883
Philippines
Message 25
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Subject: | Re: wig wag HID lights |
No problem, I just got bad info from a friend. I emailed CreativeAir
the same time I posted to this list and got my answer. Thanks for all
the replies.
Dave
do not archive
----- Original Message -----
From: Alan Adamson
To: aeroelectric-list@matronics.com
Sent: Monday, June 04, 2007 9:13 PM
Subject: RE: AeroElectric-List: wig wag HID lights
Bizarre Dave... Not trying to poke at you.. Seriously, they have a
device on their website that is used to wig-wag HID's. I talked them
them numerous times while they were in search for the 2" versions that
they have and they said they were flashable. I know people who have
used a simple timer circuit to flash them too....
Ah, well as an old boss of mine use to say.... "I guess the truth
changed".
Sorry, done correctly (with a warm up time), they should be able to be
flashed. Even XeVsion sells a flasher for theirs.
Alan
-------------------------------------------------------------------------
-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 11:46 PM
To: aeroelectric-list@matronics.com
Subject: Re: AeroElectric-List: wig wag HID lights
I did. Thanks!
Dave Leikam
----- Original Message -----
From: Alan Adamson
To: aeroelectric-list@matronics.com
Sent: Monday, June 04, 2007 5:21 PM
Subject: RE: AeroElectric-List: wig wag HID lights
CreativAir sells an HID wigwagger, whey don't you ask them?
Alan
-------------------------------------------------------------------------
---
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Monday, June 04, 2007 7:50 PM
To: aeroelectric-list@matronics.com
Subject: AeroElectric-List: wig wag HID lights
I was told I cannot wig wag the HID lights I purchased from
CreativeAir. True or False???
Dave Leikam
RV-10 40496
QB Wings
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
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 26
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Subject: | Re: Dropping Voltage to 5V from 12V |
I used a DC-DC converter for powering 2 5V devices from ship power.
Works really well for that. I tried LM7805's and didn't have good
luck because they couldn't deliver nearly the current well enough.
It depends on your draw, but I was using hard drive type video
ipod type devices and they just didn't do a great job and they
got really hot. The DC-DC converters can handle more load if you
buy the right one, and they'll do a great job.
Tim Olson - RV-10 N104CD - Flying
do not archive
Alan Adamson wrote:
>
> Boy we are onto this topic tonight aren't we... Let's see for 5v it's a
> 7805, for 9v it's a 7809, to get to 12v from higher, it's a 7812. They even
> make a 7810 for 10v... Negative voltage versions are 79xx :)
>
> Try LM7805 with a small number of additional components. All the major
> mailorder places carry them, but can't tell you where to go in the
> Philippines.
>
> Alan
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Mark
> Cupitt
> Sent: Monday, June 04, 2007 10:50 PM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Dropping Voltage to 5V from 12V
>
> --> <mark@metalcrafters.ph>
>
> Hi There Folks
>
> I need to supply a small device in the cockpit with 5V from a 12V aircraft
> supply. One way to do this is with a transformer I would guess. Is there a
> way to do it with resistors. The current requirement is 200-300 milliamps.
>
> Appreciate any suggestions and recommendations
>
> Regards
>
> Mark Cupitt
> RP-C883
> Philippines
>
>
>
>
>
>
>
>
>
>
>
>
Message 27
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Subject: | Amp sensing with hall effect |
I started witring up my hall sensor tonight but thought I should get a peer review
on my electrical monitoring concept before I go further. My particulars are:
RV-7A
Z-13/8 with fuse blocks
GRT EIS-4000
GRT Horizon 1 EFIS (single)
P-Mag, E-Mag
I wired up a single hall effect sensor with 3 wires going through it: M-bus feed
from a FW mounted ANL; B-bus feed from the hot side of the battery contactor;
SD-8 feed from the SD-8 relay to the B-bus. My architecture is based on the
ability to read total bus amperage on 1 sensor in both primary and alternate operating
modes. Operating in either mode will show the total amps: in primary
mode the M-bus and B-bus will be totaled (of course the M-bus will include the
E-bus through the diode); in alternate mode, the SD-8 feed will be added to the
sensor on its way to the B-bus, thense to the E-bus. Battery charging can be
determined by subtracting total bus amps from the alternator output to determine
amps available to charge the battery. As I have both the SD-8 and a P-mag,
I'm less concerned about knowing the exact in/out amperage condition of the
battery than I am with knowing my actual bus amps when operating on the SD-8.
I don't desire to add a second sensor or a switching capability.
The GRT system will show bus voltage with ample low voltage warning in all operating
modes.
Just asking for comments to see if I missed anything before I commit the acts of
cutting, stripping, crimping, soldering and drilling.
Thanks,
Jekyll
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=116592#116592
Message 28
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Subject: | Re: Dropping Voltage to 5V from 12V |
From 12volts, if you have any sort of significant current you really
need a heatsink. To get an idea of how much heat you'll be giving off,
if you're dropping 7 volts (12->5) at 750mA, you're dissapating 7V*.750A
= 5.25 watts. That's a lot for a tiny little package.
If you're at 200ma, it's 7*.2=3.5watts....which is still gonna get
pretty warm I would think. It'll be worse at 13.8V.
So the two things to do are:
a) drive the device with as much voltage as you can....check the specs
to see what it can take....maybe it's okay up to 8 volts, and you can
drive it safely at 7.5 with the linear regulator instead....LM317 if I
remember right (requires a couple of extra resistors to make it
work...no big deal). With the right heat sink, this can safely drive >
1A....Off the top of my head I remember 1.5A as being the rated
current. The 7805 is significantly less (.5A, or thereabouts). Just
remember that the less it has to drop from 13.8, the less heat you'll
need to dissipate.
b) order the heat sink for it. It attaches with a 2-56 or 4-40 screw
(can't remember at the moment)...piece of cake.
re: resistors....you can make a voltage divider, or something like that,
but you won't get 5V out the other end. You'll get some function of the
bus voltage (which will vary between 12.x Volts and 14.x Volts).
Ok, someone double check my math...I'm half asleep over here! :)
-John
Tim Olson wrote:
>
> I used a DC-DC converter for powering 2 5V devices from ship power.
> Works really well for that. I tried LM7805's and didn't have good
> luck because they couldn't deliver nearly the current well enough.
> It depends on your draw, but I was using hard drive type video
> ipod type devices and they just didn't do a great job and they
> got really hot. The DC-DC converters can handle more load if you
> buy the right one, and they'll do a great job.
>
> Tim Olson - RV-10 N104CD - Flying
> do not archive
>
>
> Alan Adamson wrote:
>> <aadamson@highrf.com>
>>
>> Boy we are onto this topic tonight aren't we... Let's see for 5v it's a
>> 7805, for 9v it's a 7809, to get to 12v from higher, it's a 7812.
>> They even
>> make a 7810 for 10v... Negative voltage versions are 79xx :)
>>
>> Try LM7805 with a small number of additional components. All the major
>> mailorder places carry them, but can't tell you where to go in the
>> Philippines.
>>
>> Alan
>> -----Original Message-----
>> From: owner-aeroelectric-list-server@matronics.com
>> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Mark
>> Cupitt
>> Sent: Monday, June 04, 2007 10:50 PM
>> To: aeroelectric-list@matronics.com
>> Subject: AeroElectric-List: Dropping Voltage to 5V from 12V
>>
>> <mark@metalcrafters.ph>
>>
>> Hi There Folks
>>
>> I need to supply a small device in the cockpit with 5V from a 12V
>> aircraft
>> supply. One way to do this is with a transformer I would guess. Is
>> there a
>> way to do it with resistors. The current requirement is 200-300
>> milliamps.
>>
>> Appreciate any suggestions and recommendations
>>
>> Regards
>>
>> Mark Cupitt
>> RP-C883
>> Philippines
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
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