Yes, just put the 220K resistor from where the wire on the board is
connected and wire it to the middle terminal on the freq pot.
What I try to emphasize is that the Steiner VCF circuit is sensitive to the
gain of the transistors, which is a highly variable parameter. You may or
may not require the modifications depending on your transistors. I can say
that several people had similar results to mine before the modifications,
with the frequency range knob only useful to the 11 or 12 o'clock position,
while other people on this list apparently had a fuller control range and
didn't need the modifications. The values I ended up with did correspond
fairly closely to values I found on a Japanese version of the schematic.
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
connected and wire it to the middle terminal on the freq pot.
What I try to emphasize is that the Steiner VCF circuit is sensitive to the
gain of the transistors, which is a highly variable parameter. You may or
may not require the modifications depending on your transistors. I can say
that several people had similar results to mine before the modifications,
with the frequency range knob only useful to the 11 or 12 o'clock position,
while other people on this list apparently had a fuller control range and
didn't need the modifications. The values I ended up with did correspond
fairly closely to values I found on a Japanese version of the schematic.
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
> -----Original Message-----
> From: earthtodylan2000 [mailto:earthtodylan2000@...]
>
> Ken,
> My 2nd question is from your Synthacon mod webpage under...
>
> "Notes from John Loffink"
>
> Again it's...
>
> " I also added 220K of series resistance to the FREQ knob."
>
> Do I just put a 220k resistor from wire from the board to the
> middle terminal of the FREQ pot?
>
> I'd just like to understand how to do this.
>
> Thanks
>
> Dave
>