Today's Message Index:
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1. 05:06 AM - What guage wire for alternator to bus bar (kmiller)
2. 07:01 AM - Re: Using LEDs in Series (Eric M. Jones)
3. 10:31 AM - Re: Using LEDs in Series (dfritzj)
4. 10:31 AM - Ipad for glass cockpit display (Eric M. Jones)
Message 1
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| Subject: | What guage wire for alternator to bus bar |
sorry ( i am a newbie to this forum ) if this is already answered else where,
but i would like to know the minimum gauge wire i should use for a 60amp alternator
(15V) to the Bus bar which is 5ft away. In normal operation max current
draw in flight would be 12 amps ( landing lights , nav lights, radio, transponder,
solenoids)
In addition, (and this may seem like a silly idea), but I actually want to limit
the maximum current that could go into my lithium Ion Phosphate battery immediately
after start up to say 10 amps, how would I go about this ? Currently
it is drawing max amps out of the alternator for the rotation speed (1200
rpm) for a few minutes, and I think this was the reason for my alternator drive
coupling slipping.
Keith
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KIS owner
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379681#379681
Message 2
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| Subject: | Re: Using LEDs in Series |
> ... For a switching regulator (digital) that is "noise free with really good
design," you say that it involves knowing what frequency spectrum you can use
for switching ... something that won't interfere. As diverse as our airplanes
are, with several systems and with ubiquitous installation techniques and paths,
how does one design a noise free switching regulator? The only way I can think
of is to design it with passive filtering and packaging methods such that
radiated and conducted EMI is reduced to something extremely low. This would also
involve extensive testing to verify the low EMI. That kind of design and testing
would cost a pretty peso.
>
> Seems to me the safest way to go is an active linear regulator with a sufficient
back plate to dissipate the heat. Henador Titzoff
Henador,
Yes, yes and yes. But this is drifting off the AeroElectric List interest level,
so let's not post here.
I carefully removed the potting from the Buck-Puck that Bob N. designed the filter
for and discovered that it was (IMHO) a very poor design. It could have been
much quieter with 1) A clock line that didn't wander around the board like
a drunken sailor and 2) a four-layer board which would have cost a dime more.
Several of the semiconductor companies (like National and TI) have design programs
where you just punch in the parameters and they give you a well-designed
PCB and parts list. Also Vicor, Astrodyne and other higher-end companies have
good switcher designs that are used in aircraft all the time.
I once had a 175W switcher design tested by an RFI/EMI lab and the test guy said
he thought his equipment had broken because he couldn't tell if the unit was
ON or OFF by looking at his spectrum analyzer. High praise indeed! It was remarkable,
quite simple and used virtually no line filtering. The designer was
brilliant...but he said he didn't really like designing power supplies and went
to work for a specialty custom IC house.
do not archive
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379690#379690
Message 3
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| Subject: | Re: Using LEDs in Series |
Thanks for the in-depth answer, Eric. It sounds like I should stick to a more classic
approach. I didn't like the idea of a whole set of lights going out for
one failure anyway (too many bad Christmas-tree memories...)
Dan
Message 4
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| Subject: | Ipad for glass cockpit display |
Not a heads up display but remarkable. Prices are going down...
http://preview.tinyurl.com/cgz9t2r
do not archive
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379711#379711
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