Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

Andrew;

I'm still in the "theory" stage of everything.

It appears that my measurements as far as amplitudes went were probably
completely off. They were done with a "x10" probe setting since this seemed
to affect the operation of the KLM-367 least. However the waveforms and
values looked very different from what I am getting now with a "x1" probe
setting.

Using two 33pF caps (as suggested by the 8048AH datasheet) did not work out
well (instant lockup). Neither did using a quartz oscillator with the stock
value caps (very unstable).

I also experienced more stable behaviour when doing measurements yesterday.

Right now I am using a 10pF ceramic cap for C23 (instead the 22pF cap) and
the synth has yet to crash. I'll let it run for a few hours.

One thing that was odd (or may reflect on my measuring abilities...) is
that the signal for XTAL1 and XTAL2 is reading not 6 MHz but around 10 to
12 MHz. One of the new boards reads even 18 MHz!