Re: Too hot 7805

[Barry Tisdale <btisdale@cybersol.com>]

Bruce -

Also check for a shorted bypass cap after the '05; these can go shorted w/o
leaking any smoke.  Start removing stuff from the board till things get
right; you *do* socket your ICs, right?  I used a 7812 before the 7805 in
my MAX232 circuit; there are some spikes to over 24v in the car wiring that
can get thru the 05 & fry the caps.  Warm = ok, logo on finger = too hot;
shouldn't need a heatsink in your app.

Barry

At 11:22 PM 01/27/2000 -0500, you wrote:
>I'm running a 7805, to supply 5v to a 2732, and 2 74LC 161s, all the load is
>a LED with a 1K inline resistor.
>   The 7805 is really hot after just seconds, I've checked my wiring a
>jillion times, ans still that way.
>  Can this 3 chips be drawing that much current?.
>Grumpy
>  This is for the ecm bench, and when "proven" will be ready for prime time
>(FTP).
>
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