Fine Pitch / Fine Pitch Offset
The Fine Pitch Mod consists of simply wiring a 5K pot in series
with the original 100K pitch and/or pitch offset control to
create a coarse/fine system. The fine control has 5% of the
effect that the coarse control has on the associated VCO pitch.
When using the new system, always adjust the fine control to mid-
range first. Then use the coarse control to get close, trimming
out with the fine. This system allows much better control over
the flange effect between the two VCO signals. I have an extra
panel mounted above and below my FatMan. I positioned the fine
controls directly above the coarse (original) ones on the added
upper panel. An alternative approach is to replace the 100K 3/4
turn pot with a 100K 10 or 20 turn pot. This is a more expensive
method, however.
|