piclist 2002\07\06\094630a >
Thread: .1uf between Vcc and gnd ???
www.piclist.com/techref/microchip/devices.htm?key=pic
picon face BY : Dave Dilatush email (remove spam text)



David Covick wrote...

>I'm sure someone on this list will tell me that what I did was wrong, but
>since it works fine I'd be happy to hear from someone at to why it is a bad
>idea.

Leaving out bypass capacitors is not a "bad idea" if you're
willing to risk the problems that can result from leaving them
out.  In the case you cited, you accepted that risk and got
lucky.

But you don't always get lucky.  And when inadequate bypassing
does cause problems, those problems can be an absolute screaming,
drooling nightmare to troubleshoot: wierd, baffling, erratic
symptoms that defy all logic and come and go seemingly at random.

To paraphrase the unfortunate Dan Quayle: the mind is a terrible
thing to lose- especially over something as basic as good power
supply hygiene.

Skimping on bypass capacitors may be a good way to drive yourself
crazy; but it's not a cost-saving technique that I would ever,
EVER choose- no matter how much pressure I was under to save
money.  Been there.  Done that.  It ain't worth the pain.

DD

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