[sdiy] [AH] SH-101 VCA DC offset trimmer?

Altitude altitude at optrand.com
Thu Jun 14 13:47:38 CEST 2012


It's a trimmer and a resistor that connects to pin 2 of the BA662A
(R201)This is the same trick used to adjust the DC offset on the x0xb0x with
the BA6110.  I use a 10M resistor and a 50KB Pot (thanks to B Castro).
Works really well, you can get the "pop" down to nothing

http://midiot.net/blog/?p=3

It looks like Roland just went with "offset selected" op amps and never
populated the trimmer

-----Original Message-----
From: Doug Terrebonne [mailto:dougt55 at yahoo.com] 
Sent: Thursday, June 14, 2012 2:50 AM
To: synth-diy
Cc: AH
Subject: [AH] SH-101 VCA DC offset trimmer?

So for some reason Roland didn't include a VCA offset adjustment trimmer in
the SH-101. There is a location for one on the PCB though - 


http://www.synthparts.com/sh101pcb1.jpg

When replacing the BA662A VCA it would be nice to have that adjustment.
Anyone 
ever try installing a 100K or so trimmer there? Looks like the proper traces
are 
going to it...

Doug 
synthparts.com




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