Today's Message Index:
----------------------
1. 08:57 AM - Re: Re: Halogen bulbs with wig wag circuitry....failure mode (Robert L. Nuckolls, III)
2. 09:04 AM - Re: RF noise from Jeff's LED lights (Robert L. Nuckolls, III)
3. 09:43 AM - Re: Transponder troubles (Speedy11@aol.com)
4. 10:32 AM - Re: Halogen bulbs with wig wag circuitry....failure mode (Eric M. Jones)
5. 11:33 AM - Re: ...failure mode (Paul)
6. 12:08 PM - Re: Re: ...failure mode//sorry posted in error (Paul)
7. 02:56 PM - building a batter capacity tester (MLWynn@aol.com)
8. 08:14 PM - Re: building a batter capacity tester (Richard E. Tasker)
Message 1
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| Subject: | Re: Halogen bulbs with wig wag circuitry....failure |
mode
>Wig-wagging really big halogen lamps is also easy providing a
>current surge protector is used. I have demonstrated 2X 250 watt
>lamps wig-wagging happily with our WW(c) or WW(d).
Inrush current beyond the initial cold
start is not an issue for incandescent lamps.
The reason I plotted the this data . . .
Emacs!
was to show that while the first, cold start inrush was the typical
30+ amps, subsequent start up currents were quite nominal. The lamp
being tested had a nominal on current of 4A (55w) but as you can see here,
the average start up current in the wig-wag mode was a tad above 5A.
This is because the filament doesn't cool off enough between flashes
to push the inrush even close to a cold-start value.
It isn't inrush killing these lamps by flashing them, it has to
be temperature cycling . . . for which there is no mitigating 'fix'.
After all, the reason these filaments produce white light is because
they've been elevated from below a dull red glow to the white light
produced by a metal glowing at 5000 degrees F. THATS a big temperature
shift.
I need to re-plot that trace above. There was some very strong
noise source going on at the time that produced the fuzzy spikes
on my data.
Bob . . .
Message 2
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| Subject: | Re: RF noise from Jeff's LED lights |
At 08:05 PM 9/9/2011, you wrote:
>
>I am getting a loud hiss on both aircraft radios whenever my LED
>position lights are turned on. In fact, any FM radio in the
>vicinity gets the hiss too.
>
>I have "Jeff's LED lights for RVs" installed in the wing tips along
>with Bob Archer antennas. Though it may be worth noting that the
>SL30 Comm antenna is a standard belly mounted bent whip.
>
>I know the RF is coming from the radios because if I turn the volume
>down on the radios, the noise disappears (in other words, the
>intercom is not affected).
>
>The archives have some discussion of filters, resistors and
>capacitors but I'm not sure where to start.
>
>My first inclination is to disconnect one at a time to see if the
>noise is coming from both lights. Then I don't know where to start.
Some years ago, folks were building their own
nav lights that utilized a "Buck Puck" constant
current driver. They were experiencing similar
noise problems. I proposed and fabricated a
filtered version of the Buck Puck
http://www.aeroelectric.com/Catalog/AEC/9051/
We also offered a filter-board that builders
could use to quiet Buck Pucks they already owned.
The instructions above describe a line noise filter
that proved useful on the Buck Puck. If your
fixtures use the same power supply then values
for a filter are given in the document. You might
be able to use one of our filter boards . . . or
substitute a fully assembled power supply.
Bob . . .
Message 3
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| Subject: | Re: Transponder troubles |
Bob,
Perfectly worded. Sounds like Congress.
Stan Sutterfield
Do not archive
In a message dated 9/11/2011 3:01:15 A.M. Eastern Daylight Time,
aeroelectric-list@matronics.com writes:
prime examples of what CAN happen when one agency
with no particular expertise has the power to mandate behaviors
to others without regard or responsibility for the unintended
consequences.
Message 4
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| Subject: | Re: Halogen bulbs with wig wag circuitry....failure |
mode
> Inrush current beyond the initial cold
> start is not an issue for incandescent lamps.
> The reason I plotted the this data . . .
Quite true Bob, however I tried not having a first cycle, but it never seemed to
work. You ALWAYS have a first pulse.
Also, most timers using a 555 have an initial 1.5X times longer pulse than the
second pulse. I no longer use the 555 for this reason. What I do now is have a
faster r/c oscillator and a divider to get the correct timing. I'd be glad to
share the schematic with interested parties.
Nice graph of the pulses.
I'd still bet that many halogen lamps have declined in quality. I've seen this
first-hand. There are many variables in the making of halogen lamps.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=351971#351971
Message 5
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| Subject: | Re: ...failure mode |
Bob's scope digital sampling is very slow sampling as usual. The peak inrush
current is basically current limited to the power supply and wiring and
switcher resistance. He shows one sample at over 30 amps and who knows what
the peak current is. HID do have issues with wig wag and below I got info
from a pilot who solved it.
Your current limiter as you mentioned would limit this way down and produce
a great increase in lifetime.
However if one uses the H3 bulbs there is one type of HID supply that works
well with wig wag while most do not. The H3 is a drop in for most Vans and
other wing mountes aircraft. There is also a replacement bulb for the round
lights using the same ballast that should work well.. Then you need to use a
specific toroid filter on the lines and a no bounce switch contact (solid
state).
I got the info from a suscessful fligher months ago and the parts are cheep
also Like at the time 30 for a system. NOT all hid systems will work wig wag
as the supply simply dies soon
I can go back and try to find the link if you are interested. I will not
post to Bob's list ever!!!!
Pardon the smelling but my chkr is off as comp[uter crash and ng backup is
back and running but word is the spel checker and its not reinstalled
Paul
----- Original Message -----
From: "Eric M. Jones" <emjones@charter.net>
Sent: Sunday, September 11, 2011 10:27 AM
Subject: AeroElectric-List: Re: Halogen bulbs with wig wag
circuitry....failure mode
> <emjones@charter.net>
>
>
>> Inrush current beyond the initial cold
>> start is not an issue for incandescent lamps.
>> The reason I plotted the this data . . .
>
>
> Quite true Bob, however I tried not having a first cycle, but it never
> seemed to work. You ALWAYS have a first pulse.
>
> Also, most timers using a 555 have an initial 1.5X times longer pulse than
> the second pulse. I no longer use the 555 for this reason. What I do now
> is have a faster r/c oscillator and a divider to get the correct timing.
> I'd be glad to share the schematic with interested parties.
>
> Nice graph of the pulses.
>
> I'd still bet that many halogen lamps have declined in quality. I've seen
> this first-hand. There are many variables in the making of halogen lamps.
>
> --------
> Eric M. Jones
> www.PerihelionDesign.com
> 113 Brentwood Drive
> Southbridge, MA 01550
> (508) 764-2072
> emjones@charter.net
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=351971#351971
>
>
>
Message 6
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| Subject: | Re: ...failure mode//sorry posted in error |
----- Original Message -----
From: "Paul" To: <aeroelectric-list@matronics.com>
Sent: Sunday, September 11, 2011 11:29 AM
Subject: AeroElectric-List: Re: ...failure mode
Message 7
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| Subject: | building a batter capacity tester |
I have been following the PC680 thread with great interest. I have a
couple for my RV8 that have been sitting around longer than I had meant for them
to sit. You know how construction goes.
I was going to build the capacity tester from the aeroelectric site:
_http://www.aeroelectric.com/articles/battest.pdf_
(http://www.aeroelectric.com/articles/battest.pdf)
This looks pretty straightforward and I assume that I can get all the
components from my local Radio Shack. The one thing I am foggy on is the 10 V.
Zener diode in the schematic. Never having used these, are they sold by
voltage or amperage or what. Specifically, how do I make sure I get the
correct component?
Thanks,
Michael Wynn
RV 8 Wiring
San Ramon, CA
In a message dated 9/11/2011 12:09:07 P.M. Pacific Daylight Time,
paulm@olypen.com writes:
--> AeroElectric-List message posted by: "Paul" <paulm@olypen.com>
----- Original Message -----
From: "Paul" To: <aeroelectric-list@matronics.com>
Sent: Sunday, September 11, 2011 11:29 AM
Subject: AeroElectric-List: Re: ...failure mode
Message 8
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| Subject: | Re: building a batter capacity tester |
Pretty much any 10V zener diode will work there. Zeners are sold by voltage since
that is their purpose (to control the voltage across their terminals). The
other thing that is important is the
wattage rating, although in this case the power dissipated by the zener is so low
(50mW) that any 10V zener you can buy will work.
Dick Tasker
MLWynn@aol.com wrote:
> I have been following the PC680 thread with great interest. I have a couple
for my RV8 that have been sitting around longer than I had meant for them to sit.
You know how construction goes.
> I was going to build the capacity tester from the aeroelectric site:
> http://www.aeroelectric.com/articles/battest.pdf
> This looks pretty straightforward and I assume that I can get all the components
from my local Radio Shack. The one thing I am foggy on is the 10 V. Zener
diode in the schematic. Never having used
> these, are they sold by voltage or amperage or what. Specifically, how do I
make sure I get the correct component?
> Thanks,
> Michael Wynn
> RV 8 Wiring
> San Ramon, CA
> In a message dated 9/11/2011 12:09:07 P.M. Pacific Daylight Time, paulm@olypen.com
writes:
>
>
>
> ----- Original Message -----
> From: "Paul" To: <aeroelectric-list@matronics.com>
> Sent: Sunday, September 11, 2011 11:29 AM
> Subject: AeroElectric-List: Re: ...failure = Use ilities ay
- MATRONICS WEB FORUMS - List Contribution Web Site p;
>
>
> *
>
>
> *
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