[sdiy] ASM-1 VCO troubles another time

[Fortner Florian]

Hi List,

You boys were right, it WAS the J-FET! The 2N3819 is simply to slow to reset
the Integrator cap, I soldered in a J111 (30 Ohm , 5-7ns risetime) and the
VCO works just fine!
But there is another funny thing: I have two VCO's on the PCB, feeding both
with the same CV of, say, 50mV (at the base of the exponential pair), I get
a nice 1.4kHz saw from one of the VCO's, but the other one "swings" with
15kHz. How's that possible?? I have everywhere the same part values, the
trimmers are in the same positions, so I can't find the bug.
Is it normal that the Squarewave moves up and down when I turn the
Pulsewidth knob? Looks strange on the oscilloscope, but yet I didn't listen
to it.

regards,

flo