Today's Message Index:
----------------------
1. 05:37 AM - Re: Electroair ignition (Chuck Jensen)
2. 05:42 AM - Re: Electroair ignition (Peter Laurence)
3. 06:37 AM - Re: Kitplanes article on an Elegant LED driver (David E. Nelson)
4. 07:11 AM - Re: Kitplanes article on an Elegant LED driver (Ernest Christley)
5. 07:19 AM - Re: Electroair ignition (Dave Leikam)
6. 08:05 AM - Avionics Back-Up Power (Carlos Trigo)
7. 08:26 AM - Re: Kitplanes article on an Elegant LED driver (Robert L. Nuckolls, III)
8. 08:28 AM - Re: Avionics Back-Up Power (Robert L. Nuckolls, III)
9. 08:38 AM - Re: Kitplanes article on an Elegant LED driver (David E. Nelson)
10. 09:18 AM - Re: Avionics Back-Up Power (Carlos Trigo)
11. 10:39 AM - Re: Kitplanes article on an Elegant LED driver (Ernest Christley)
12. 12:34 PM - 430W to Analog autopilot (sam@fr8dog.net)
13. 01:22 PM - Re: 430W to Analog autopilot (Bill Denton)
Message 1
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| Subject: | Electroair ignition |
Experience in, like how to troubleshoot and adjust, or in, like has
anyone flown them. I can only help on the latter. About 700 hours with
Electroair on one side, mag on the other on a Velocity XLRG. I woudn't
know much about troubleshooting/repairing....never had to.
Chuck Jensen
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Dave
Leikam
Sent: Friday, August 29, 2008 12:09 AM
Subject: AeroElectric-List: Electroair ignition
Does anyone have experience with Electroair ignitions? Compared to
Lightspeed?
Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI
Canopy trimming
Message 2
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| Subject: | Electroair ignition |
Yes
Peter
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Friday, August 29, 2008 12:09 AM
Subject: AeroElectric-List: Electroair ignition
Does anyone have experience with Electroair ignitions? Compared to
Lightspeed?
Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI
Canopy trimming
Message 3
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| Subject: | Re: Kitplanes article on an Elegant LED driver |
Hi Bob,
I'm curious, why is such a high freq (1-2MHz) needed for an application
such as this? Rather, why not in high 100's of Hz given that the eye
can't even discern above 30 Hz?
Thank you,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
On Thu, 28 Aug 2008, Robert L. Nuckolls, III wrote:
> <snip>
> http://www.national.com/ds/LM/LM3404.pdf
>
> This is one of a host of similar one to multi-channel dimmer
> controllers. The 3404 delivers up to of constant current
> to it's companion loads.
>
> It's a switcher. It hums at 1 to 2 Mhz with a butt-ugly
> wave-form rich in harmonics. This device needs to be
> a very compact layout (small antenna aperture) and be fitted
> with conduction filters on the input/output wires. It
> MIGHT be okay in a plastic enclosure . . . but a metal
> one never hurts.
> <snip>
Message 4
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| Subject: | Re: Kitplanes article on an Elegant LED driver |
David E. Nelson wrote:
> <david.nelson@pobox.com>
>
>
> Hi Bob,
>
> I'm curious, why is such a high freq (1-2MHz) needed for an
> application such as this? Rather, why not in high 100's of Hz given
> that the eye can't even discern above 30 Hz?
>
100's of Hz will put you in the audio range and possibly give a humm in
the audio portions of the airplane. Somewhere just above 30KHz would
seem like the best frequency range.
Message 5
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| Subject: | Re: Electroair ignition |
Would you be willing to elaborate? If so, please do. Thanks.
Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI
----- Original Message -----
From: Peter Laurence
To: aeroelectric-list@matronics.com
Sent: Friday, August 29, 2008 7:41 AM
Subject: RE: AeroElectric-List: Electroair ignition
Yes
Peter
-------------------------------------------------------------------------
-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Leikam
Sent: Friday, August 29, 2008 12:09 AM
To: aeroelectric-list@matronics.com; RV-10 matronics
Subject: AeroElectric-List: Electroair ignition
Does anyone have experience with Electroair ignitions? Compared to
Lightspeed?
Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI
Canopy trimming
http://www.matronics.com/contribution
Message 6
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| Subject: | Avionics Back-Up Power |
Bob and the group
Since I had to put some weight in the tail of my RV-9A, I decided to install
a battery as back-up power to some avionics, the EFIS, the COMM Radio and
the Transponder.
My GRT EFIS has 2 power inputs, which are internally controlled (EFIS uses
the electrons from the highest source), so this is easy to wire.
However, the Radio (SL-30) and the Transponder (GTX-330) only have 1 power
input, therefore the question:
- How should I wire power, both from Main Battery and Back-Up Battery, to
the COMM Radio and the Transponder?
Help appreciated
Carlos
Message 7
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| Subject: | Re: Kitplanes article on an Elegant LED driver |
At 08:31 AM 8/29/2008 -0500, you wrote:
><david.nelson@pobox.com>
>
>
>Hi Bob,
>
>I'm curious, why is such a high freq (1-2MHz) needed for an application
>such as this? Rather, why not in high 100's of Hz given that the eye
>can't even discern above 30 Hz?
>
>Thank you,
>
> /\/elson
Great question. The problem of selecting an operating
frequency comes from a trade-off in reactances . . .
in the form of inductors and capacitors. The higher
you go in frequency, the more energy can be stored on
a given size inductor (assuming the core is loss less).
The higher you go in frequency, the easier it is to
couple energy via capacitors . . . both for the purpose
of bypassing and transfer.
In this case, the power supply is an energy conversion
system that stores a short pulse of current on and inductor
and then retrieves that energy at a different voltage level.
Given no other considerations for efficiency of the switching
devices and losses in the magnetics, one would LIKE to operate
at the highest possible frequency to drive down the physical
size of components.
Example. Step down transformers for 60 Hz AC delivered to
the house can handle about 60 watts per pound of transformer
core and copper. Airplanes use 400 Hz and the same transformer
weight and volume can handle over 6 times the power . . .
but the iron for the transformer must be tailored for low
losses at the higher frequency.
The high output LEDs need about 4v per lamp (whites) but
they're CURRENT driven devices. The really cool thing about
switchmode power supplies is that you can take energy in
at voltages in a much below or above the desired output
levels and bring the energy out as either a constant current
or constant votlage. The LM3404 is designed to operate in
the constant-current mode.
Batteries are not constant voltage devices . . . so the
most efficient flashlights will have a rather sophisticated
voltage to constant current generator that accepts battery
voltage over the full range useful output and delivers
a constant current to the lamp until the batteries are
truly drained. These converters need to be tiny and
efficient . . . highest practical operating frequency
is a strong consideration in meeting design goals.
Bob . . .
Message 8
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| Subject: | Re: Avionics Back-Up Power |
At 04:04 PM 8/29/2008 +0100, you wrote:
>Bob and the group
>
>
>Since I had to put some weight in the tail of my RV-9A, I decided to
>install a battery as back-up power to some avionics, the EFIS, the COMM
>Radio and the Transponder.
>
>
>My GRT EFIS has 2 power inputs, which are internally controlled (EFIS uses
>the electrons from the highest source), so this is easy to wire.
>
>However, the Radio (SL-30) and the Transponder (GTX-330) only have 1 power
>input, therefore the question:
>
>
> - How should I wire power, both from Main Battery and Back-Up Battery,
> to the COMM Radio and the Transponder?
How big a battery is it? How many batteries does the airplane
carry already . . . in other words do you already have an
AUX battery?
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 9
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| Subject: | Re: Kitplanes article on an Elegant LED driver |
Hi Ernest,
Ok, 30KHz makes sense. Although 30Hz may not be within the dynamic range
of the audio equipment, I could definately see a square wave's odd
harmonics (90 Hz and 150 Hz, etc IIRC) reaching up into a sensitive audio
area. Interesting.
So now, why the MHz freq the LM3404?
Thank you,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
On Fri, 29 Aug 2008, Ernest Christley wrote:
> <echristley@nc.rr.com>
>
> David E. Nelson wrote:
>> <david.nelson@pobox.com>
>>
>>
>> Hi Bob,
>>
>> I'm curious, why is such a high freq (1-2MHz) needed for an application
>> such as this? Rather, why not in high 100's of Hz given that the eye can't
>> even discern above 30 Hz?
>>
> 100's of Hz will put you in the audio range and possibly give a humm in the
> audio portions of the airplane. Somewhere just above 30KHz would seem like
> the best frequency range.
>
>
Message 10
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| Subject: | Avionics Back-Up Power |
> >
> >Since I had to put some weight in the tail of my RV-9A, I decided to
> >install a battery as back-up power to some avionics, the EFIS, the COMM
> >Radio and the Transponder.
> >
> >
> >My GRT EFIS has 2 power inputs, which are internally controlled (EFIS
uses
> >the electrons from the highest source), so this is easy to wire.
> >
> >However, the Radio (SL-30) and the Transponder (GTX-330) only have 1
power
> >input, therefore the question:
> >
> >
> > - How should I wire power, both from Main Battery and Back-Up Battery,
> > to the COMM Radio and the Transponder?
>
> How big a battery is it? How many batteries does the airplane
> carry already . . . in other words do you already have an
> AUX battery?
>
> Bob . . .
I don't know exactly, because I still don't know the exact weight I need for
W & B, but I am planning for a battery around 10Ah
I do have 2 other batteries, Main and AUX, since my engine is an
electron-dependant Subaru.
Carlos
Message 11
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| Subject: | Re: Kitplanes article on an Elegant LED driver |
David E. Nelson wrote:
>
> So now, why the MHz freq the LM3404?
I think Bob answered that well. Switching power supplies have an easier
time of it at higher frequencies. The power supply in the back of your
computer converts the 60Hz line signal up to something like 10KHz (IIRC)
for the same reason. It is much easier to transform and then rectify a
higher frequency signal to a clean output. The components can be much
smaller and there is less heat generated.
Message 12
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| Subject: | 430W to Analog autopilot |
Does anybody know if there is a way to connect a Garmin 430W to a Piper IIIB analog
autopilot?Maybe where I can find information?
Message 13
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| Subject: | 430W to Analog autopilot |
You might try:
http://www.centuryflight.com/index.html
I think they made the autopilot...
Thanks!
Bill Denton
bdenton@bdenton.com
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of sam@fr8dog.net
Sent: Friday, August 29, 2008 3:31 PM
Subject: AeroElectric-List: 430W to Analog autopilot
Does anybody know if there is a way to connect a Garmin 430W to a Piper IIIB analog
autopilot?Maybe where I can find information?
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