To All:
I've just completed an MOTM version of Marc Bareille's Polyvoks VCF
clone. I had purchased a couple of his pcb's after breadboarding his
circuit with excellent results. Check it out at
http://m.bareille.free.fr/modular1/vcf_polivoks/vcf_polivoks.htm if
you need something different. The schematic will make you do a
double take, however. It looks like a normal two pole filter until
you clean your glasses and find NO CAPS! The current-programmable op
amps are used to limit the gain bandwidth. This makes for a rather
quiet filter.
This filter begs to be overdriven and a drive control at the audio
input is a nice addition. The overdrive sound is smooth and very
pleasant with any waveform. The range of self-resonance is limited
(no, I didn't measure it...)to about 300Hz-above audio. High Q
settings are very wild. Perfect for irritating the family!
I tried to stay with the Soviet Military motif by painting the panel
flat olive drab and hand lettering in orange. The knobs are big
brown phenolic jobs. Very Cold War cool - I'll take a picture of it
tonight!
Thanks Marc!
Chub- never say "nyet"!