Today's Message Index:
----------------------
1. 05:21 AM - Re: Dimmers & LED Indicators (Mark Banus)
2. 05:42 AM - Re: Dimmers & LED Indicators (John Schroeder)
3. 07:56 AM - Re: Dimmers & LED Indicators (Eric M. Jones)
4. 01:06 PM - What happens if Master contactor fails? (Matthew Brandes)
5. 02:07 PM - Re: What happens if Master contactor fails? (chad-c_sip@stanfordalumni.org)
6. 02:35 PM - Re: Dimmers & LED indicators (Carlos Trigo)
7. 03:20 PM - Oshkosh forum (Tom Barter)
8. 05:40 PM - Re: Oshkosh forum (Robert L. Nuckolls, III)
9. 06:47 PM - Re: Split Pin Connectors? (Jim Bean)
10. 07:50 PM - Re: Re: Dimmers & LED indicators (John Schroeder)
11. 09:47 PM - Garmin 196 interferes with com radio (Cameron Kurth)
Message 1
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| Subject: | Re: Dimmers & LED Indicators |
--> AeroElectric-List message posted by: "Mark Banus" <mbanus@hotmail.com>
I found that this work well for LEDs and Switch lights. http://www.periheliondesign.com/Vregflyer.htm
Mark Banus
Message 2
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| Subject: | Re: Dimmers & LED Indicators |
--> AeroElectric-List message posted by: "John Schroeder" <jschroeder@perigee.net>
Bob -
Check the installation instructions of the RC Allen indicators. I believe
the LEDs on these are not dimmed by a dimmer. Rather, they have to have a
connection to full buss voltage for dimming. As you can figure, this gives
you only one position for the dim. I didn't believe it and called RC
Allen. They confirmed it. WE thern wired it to the panel light switch that
also controls the power to the panel lights dimmer.
I installed a B&C dimmer and it works for dimming the LED's on the Garmin
340 Audio Panel. With the pot fully counterclockwise, these LED's are off.
With it fully clockwise, the LED's are bright. If you want it the other
way around, you might call B&C and ask if you can switch the leads from
the pot to the dimmer.
We had the 340 LED's hooked to a 4 channel Pulse Width Modulated dimmer
and that made the LED's flicker. So we switched them to the B&C dimmer.
Turns out that the 340 has its own peculiar LED biasing system and needs a
straight voltage variation for dimming.We have both dimmers installed. The
PWM is a Flight Data Systems product and was specially designed for LED
dimming.
http://www.fdatasystems.com/
It is the LC-40 and sells for $89
I have no clue about the pillar point switch/controller.
Hope this helps,
John Schroeder
On Mon, 4 Jul 2005 18:59:28 -0500, r falstad <bobair8@msn.com> wrote:
> --> AeroElectric-List message posted by: "r falstad" <bobair8@msn.com>
>
> Folks,
>
> I'm installing B&C's DIM 15-14 Dimmer Assembly, Pillar Point Fuel Pump
> Switch/Controller and Ray Allen RP3 LED position indicator for elevator
> trim in my GlaStar.
>
> The Pillar Point installation instructions say to wire the lighting
> control wire into a dimmer. I tried it with the DIM 15-14 and it didn't
> have any effect on the LED light intensity.
>
> I also have the same question about the Ray Allen LED trim indicator.
>
> Any suggestions on how to dim the LEDs in these two indicators? It also
> strikes me that there is a complication. As I turn my dimmer pot
> clockwise, the resistance goes down, the voltage goes up and the lights
> get brighter. I'm going to want the LEDs at their maximum brightness
> during the day so I can see them in sunlight. I don't want my panel
> lights at full bright during the day but if I use the same dimmer for
> panel lights as I do for the LED indicators, my indicators will be dim
> during the day and I'll have to turn the voltage up to see them.
>
> Is there another dimmer module or a simple ol' pot that will work in
> this application? (If I need another dimmer/pot, I'd like to use one to
> control both the fuel pump controller and the trim indicator to save
> panel space.)
>
> Best regards,
>
> Bob
>
>
--
Message 3
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| Subject: | Re: Dimmers & LED Indicators |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
> Check out June and July 2001, at this link:
>http://www.rst-engr.com/kitplanes/
Jim Weir should have added some caveats to this--like a filter capacitor is
needed in the output stage to drive LEDs. Otherwise--welcome to the disco
party fella, and it's in your own cockpit.
Chew on some hard candy in front of your monitor to find out why. The
stroboscopic effect induced by vibration OR pulse-width modulation is a
visual distraction and is to be avoided unless the frequency is out of the
range of visual and vibration effects (depends on the application).
Since microprocessor LED displays usually operate in the MHz, this is rarely
a problem. But if you chose to roll your own and pulse-width modulate the
LEDs at up to many many kilohertz....The sad part is that they may look okay
on the workbench. LEDs are capable of being strobes very fast, and circuitry
built for incandescent lamps may not work well. Usually a capacitor on the
output will fix the problem.
The Urban Legend that LEDs need pulse-width modulation needs squashing. LEDs
work just fine by varying the power to them in a purely DC fashion. The
difference is in the control circuitry. A pulse-width dimmer can be built
that dissipates almost no heat, and thus is extremely efficient. On the
other hand, it has more parts and produces some electromagnetic interference
(EMI) and strobe effects.
Remember to use LEDs in series to lower the required current, since the
current determines how beefy the power supply needs to be. For example: LEDs
have a small forward voltage (that's the voltage when they begin to
light)...so you can divide you battery voltage by the LED's forwad voltage
to determine the number you can put in series. (More or less.)
I sell a little EGPAVR (Extremely General Purpose Adjustable Voltage
Regulator) dimmer for LEDs and lamps that is about as small and light as one
can design. Everyone else sells some thing similar, but bigger and heavier
and more expensive.
Eric M. Jones (Glastar 5540)
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
(508) 764-2072
"Nothing is too wonderful to be true."
James Clerk Maxwell, discoverer of electromagnetism
"Too much of a good thing can be wonderful."
Mae West, discoverer of personal magnetism
Message 4
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| Subject: | What happens if Master contactor fails? |
--> AeroElectric-List message posted by: "Matthew Brandes" <matthew@n523rv.com>
It is amazing how much you learn and understand an airplanes electrical
system when you actually start wiring one.
Anyway... the question at hand... what happens (if anything) if the master
contactor fails? The alternator is connected to the battery via this
contactor... so if this thing gives up the ghost... do bad things happen?
Matthew Brandes,
Van's RV-9A (Wiring)
#90569
<http://www.n523rv.com/> http://www.n523rv.com
EAA Chapter 1329 President
EAA Chapter 868 Web Editor
Message 5
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| Subject: | Re: What happens if Master contactor fails? |
Z-USANET-MsgId: XID420JgeVgM0172X30
--> AeroElectric-List message posted by: chad-c_sip@stanfordalumni.org
If you wire your plane as per one of the "Z" figures in Bob's book that
shouldn't be a problem. Bob always routes a secondary path for the electrons
to get to the essential bus through a diode that bypasses the contactor. I'm
assuming you're thinking of a mode of failure that the contactor breaks open
and stays that way. With the E-bus diode you'll have a seondary path to the
e-bus only.
If your contactor fails closed, well that's not a problem in flight really I
would't think.
Chad
Chad Sipperley
Lancair IVP-turbine (under construction)
Phoenix, AZ
------ Original Message ------
From: "Matthew Brandes" <matthew@n523rv.com>
Subject: AeroElectric-List: What happens if Master contactor fails?
> --> AeroElectric-List message posted by: "Matthew Brandes"
<matthew@n523rv.com>
>
> It is amazing how much you learn and understand an airplanes electrical
> system when you actually start wiring one.
>
> Anyway... the question at hand... what happens (if anything) if the master
> contactor fails? The alternator is connected to the battery via this
> contactor... so if this thing gives up the ghost... do bad things happen?
>
> Matthew Brandes,
> Van's RV-9A (Wiring)
> #90569
> <http://www.n523rv.com/> http://www.n523rv.com
>
> EAA Chapter 1329 President
> EAA Chapter 868 Web Editor
>
>
>
>
>
>
>
Message 6
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Received-SPF: softfail (mta8: domain of transitioning trigo@mail.telepac.pt does
not designate 85.138.30.109 as permitted sender) receiver=mta8; client_ip=85.138.30.109;
envelope-from=trigo@mail.telepac.pt;
| Subject: | Re: Dimmers & LED indicators |
--> AeroElectric-List message posted by: "Carlos Trigo" <trigo@mail.telepac.pt>
Eric
Does your EGPAVR also dim the indicators from RAC?
Carlos
Message 7
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--> AeroElectric-List message posted by: "Tom Barter" <kesleyel@iowatelecom.net>
Bob,
After checking the forums list for EAA Oshkosh, I noticed that your name is
no longer listed. Is this an oversight, or will you not be giving a
presentation? I hope will still be there, as I really enjoyed visiting with
you last year.
Tom Barter
Kesley, IA
Avid Magnum
Working on electrical systems
Message 8
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| Subject: | Re: Oshkosh forum |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 05:19 PM 7/5/2005 -0500, you wrote:
>--> AeroElectric-List message posted by: "Tom Barter"
><kesleyel@iowatelecom.net>
>
>Bob,
>
>After checking the forums list for EAA Oshkosh, I noticed that your name is
>no longer listed. Is this an oversight, or will you not be giving a
>presentation? I hope will still be there, as I really enjoyed visiting with
>you last year.
>
>
>Tom Barter
We were planning to be at OSH again this year but a number
of inter-related requirements for attending just didn't come
together. I had to beg off the Saturday forum for 2005. We'll
try again next year.
Bob . . .
Message 9
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| Subject: | Re: Split Pin Connectors? |
--> AeroElectric-List message posted by: Jim Bean <jim-bean@att.net>
This probably has nothing to do with the posters "split pins". As a
young engineer many years ago I honchoed the install of an expensive
RADAR prototype in a destroyer. The cables were made up by the Boston
navy yard. Whoever inserted the pins into the connectors apparently used
a very sharp screwdriver to push them in. All of barrels of the pins
were split and expanded resulting in a massive short. Really let the
blue smoke out.
Jim Bean
Message 10
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| Subject: | Re: Dimmers & LED indicators |
--> AeroElectric-List message posted by: "John Schroeder" <jschroeder@perigee.net>
Carlos -
Not according to the tech @ Ray Allen. Let me know if this is not so.
Thanks,
John
On Tue, 5 Jul 2005 22:34:41 +0100, Carlos Trigo <trigo@mail.telepac.pt>
wrote:
> --> AeroElectric-List message posted by: "Carlos Trigo"
> <trigo@mail.telepac.pt>
>
> Eric
>
> Does your EGPAVR also dim the indicators from RAC?
>
> Carlos
>
>
--
Message 11
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| Subject: | Garmin 196 interferes with com radio |
--> AeroElectric-List message posted by: Cameron Kurth <cameronkurth@yahoo.com>
I have a Garmin 196 that is wired into the plane's
power buss. I get interference at a small range of
frequencies on my com radio from the Garmin (just
happens to be Detroit approach). If I pull the fuse
to the Garmin so it runs off the battery the
interference goes away. It's a similar interference
that the Dynon D10's had when they first came out.
So, what kind of filter should I use? Will the Radio
Shack 270-055 work in this situation? I called Garmin
about it. They said that the 196 was a handheld so it
has to meet the same specs as a toaster. They were
very nice about it but quite clear that it's only a
handheld so it was not designed for airplane use and
I'm on my own.
Thanks
Cam
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