piclist 2001\01\24\140735a >
Thread: [EE]: +12V and +5V in automoble
face BY : Dan Michaels email (remove spam text)

Barry Gershenfeld wrote:

{Quote hidden}

Yes, my scheme was simply a way to distribute the heat,
so the 7805 wasn't dissipating all of it. In my system,
[15-5v]*.3A = 3W in 7805 w/o distribution. Removing 1W+
to the zener helped cool everything down "enough" to apply
Roman's test --> take a baby's finger and hold it on the
hottest part of the ckt for 30 seconds; measure sound output
at 3 feet using Radio Shack sound meter; if >=105 dB, turn off
power. [jus kidding about the baby, folks].

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See also: www.piclist.com/techref/power/batterys.htm?key=12v
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Subject (change) [EE]: +12V and +5V in automoble

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