On Sun, Sep 10, 2006 at 10:49:09PM -0700, Samuel A. Falvo II wrote: > On 9/10/06, DJ Delorie <[EMAIL PROTECTED]> wrote: > >However, the two oscillators tend to self-synchronize. If I let it > >run, one LED is on and the other is off. If I put scope probes on the > >buffered outputs (pins 6 and 8), I can see that the oscillators are > >running, they're just in lock-step. Not even out of phase. > > I think you accidentally re-discovered the "synchronous oscillator." > Since all your inverters are on the same physical chip, the output of > one is likely influencing the other just enough to result in > synchrony. > > >Ideas? The only thing I can think of is inductive or capacitive > >coupling, but at 400 Hz? > > Even at such low frequencies, sharp transitions cause differential > spikes to appear on adjacent wires, and it's possible that those > perturbations can still cause circuits to interact.
You may also want to verify for coupling via the power supply ... > > Ahh ... the life of an analog circuit designer. :D > > -- > Samuel A. Falvo II > > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user