Fine tune mod was: Background Info on MOTM VCO's??
2002-08-17 by J. Larry Hendry
----- Original Message -----
Show quoted textHide quoted text
From: mmarsh100 <mmarsh@...> I seem to remember a mod discussed that narrowed the range of the FINE control. Was it Stooge Moe that discussed this? BTW, even if you are not a builder, it's probably an easy part(s?) replacement. --LH-- The mod is simple. Once trace cut, one resistor. Changes the range from 11 semitones to 3 (or size the resistor for whatever you want) Details: http://www.wiseguysynth.com/larry/mods/300mod.htm And of course, Paul is 100% correct (as always, and as I have learned from him) that the stability of fixed resistors is much better than trimmers. While my 822 circuit is not perfect, one of the things I did was make the trimmer a very small part of the overall resistance in the circuit. So, you get the best possible performance by still having trimmers. It could have been done almost without trimmers. But, that was about the best I could do at the time. The replacement is actually on the drawing board. That may happen if I ever run out of 822 PCBs (I still have plenty). Larry