Yahoo Groups archive

Doepfer

Index last updated: 2026-04-29 00:15 UTC

Message

LPG resonance mod

2005-06-08 by denis goekdag

Hi everybody,

i just thought i'd share this bit of info:

My a-101-2 didn't selfoscillate when in filter mode with res-pot set to 
max, so i decided to have a look wether i can modify it to actually do 
this ; a friend's LPG *does* oscillate, so i figured out that it should 
be rather easy to do. It was :-) When i bridged R17 (near the res-pot), 
i suddenly got a *way* loud and clipped resonance. R17 is nominally 
47k, so i figured my vactrols needed a different value there to 
compensate for some individual manufacturing tolerances...i removed the 
47k and replaced them with 22k---> voila, full oscillation , even 
clippable. Only thing is that now the res-pot has influence on the 
volume when the lpg is in vca mode...but i guess i can live with 
that:-)

cheers,
denis

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.