[sdiy] PIC freakout?

[Jay Schwichtenberg]

Karl,

I use PICs a lot and they are pretty robust.

Yes I'd probably say power. Use a scope and not a meter because there maybe
some high freq stuff on the lines or transients that the meter may not show.
Also if there is an external clock get a scope on it and check that out.
Lastly check the wiring or PCB. Sometimes if there is a connection problem
or hairline fracture in a PCB trace heat from being turned on a while can
cause issues.

Best of luck.
Jay S.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Karl Ekdahl
Sent: Tuesday, November 22, 2011 9:09 AM
To: Synth-DIY DIY
Subject: [sdiy] PIC freakout?

Hey list

So this pic that i've been using for a few months, with the same code, all
of the sudden started freaking out and spitting out garbage after about 1-2
seconds of being on and i have no idea why. I've tried several new pics with
the same code, i've even tried minimizing the code (even though it worked
just fine before and i didn't change it) to just have some test-stuff left
but to no avail. I feel like not all the PICs i tried could have been blown
(as it must have happened as soon as i put them in the socket in that case)
and since they still program that's a good testament to that too. I've
checked the power-lines and they seem fine. I'm using the internal
oscillator so no faults there.

Any ideas? Could it be something with the powerlines even tho they look just
fine on the scope? I tried hooking up a big cap to stabilize any unwanted
oscillations but no change.

so confused...

Karl

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