Re: gEDA-user: challenge board ALMOST works

[John Coppens <john@xxxxxxxxxxxx>]

On Sun, 10 Sep 2006 23:29:10 -0400
DJ Delorie <dj@xxxxxxxxxxx> wrote:

> If I put a scope probe on either feedback line (pins 1 or 13), they
> drop out of sync and the two LEDs pulse back and forth (about 17Hz).

This seriously looks like a missing GND or VCC. You might be supplying
one of the chips thru the protection diodes of the other.

Check output amplitude - they'll be different in that case.

John


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