20K are OK.Andersounds wrote:Hi all,
I'm 90% complete on a build of the VC ADSR, boards look good, just a couple of simple questions, the trimpots, I have installed 20k instead of 22k, and I'm not sure the procedure for calibration? also the dip switch, I had one so I installed it what is the purpose?
Sorry if I missed any of this.
Trimpots in the middle trim offset, on the edge trim sustain offset. Trim first middle ones. If you have oscilloscope it's easy. Switch oscilloscope to DC and trim first envelope offset to 0V, then turn sustain to min and trim to 0V too.
If you don't have an oscilloscope, check with voltmeter. Trim middle trimpots to 0V out when gate is off. Then turn all pots to min, send long gate, trim edge trimpots to 0V out when gate is on.
There is possibility to take gates from bussboard. The DIP switch turns on-off gate from bussboard. This is dual switch, top one is working.
You can don't install it if don't use bussboard gates.