Hi

hamzzzald schrieb:

> http://groups.yahoo.com/group/Doepfer_a100/photos/album/404340435/pic/1720022171/view picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
>
> ...The LM339 is a comparator chip - experiment with threshold value via R3 and R4.

I would change R3 to 68k, R4 to 2k2 and replace the connection of R3,
R4, and LM339 by a 47k lin potentiometer.

Florian