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

Hi!

I have just released with my MG (LFO) seems to be running very slowly
with the frequency knob at 10. Before I dip in with my soldering iron
does anyone know how the MG oscillator works? I have studied the
schematic and there is nothing in the design which looks remotely like
one! I believe the MG should run at 50Hz flat out. My 'scope says just
over 3Hz when I measure at the VCA MOD test point. There is an RC
network connected to the gate of Q1 on the KLM-367 which possibly
triggers a voltage at the drain over a time period. The RC nework
values (R27, C19) 10K, 0.33uF equate to a frequency of just over 48Hz,
which looks promising. Can anyone shed any light on how this bit of the
P6 works?

Thanks,
(A)