ASR FINALLY WORKING!!!!! (with ugly kludges, but it works)
2006-04-03 by keith sterling
After many hours of troubleshooting my asr is working. I never figured
out what was wrong with the board, even after breadboarding parts of
the circuit to verify voltages.
I had to hand match the buffer amps in order for there to be no counter
state offsets, and I only have 3 that match! I'm going to order 10
more in the hopes of finding a 4th that matches the rest of the 356's
on the board. I know I shouldn't have to do this, but this board
requires it. I also installed two trimpots on the input buffer to
scale the output cv correctly. For some reason I ended up with a 300mV
offset on the outputs. It's very kludge but at least it's working
right. And I've already had a lot of fun with it; with one 356
missing I get this cool "digital computer" type of sound when driving a
vco.
Thanks to Ken and cn10012t6 for your plentiful pointers towards getting
the board to work.
Keith
out what was wrong with the board, even after breadboarding parts of
the circuit to verify voltages.
I had to hand match the buffer amps in order for there to be no counter
state offsets, and I only have 3 that match! I'm going to order 10
more in the hopes of finding a 4th that matches the rest of the 356's
on the board. I know I shouldn't have to do this, but this board
requires it. I also installed two trimpots on the input buffer to
scale the output cv correctly. For some reason I ended up with a 300mV
offset on the outputs. It's very kludge but at least it's working
right. And I've already had a lot of fun with it; with one 356
missing I get this cool "digital computer" type of sound when driving a
vco.
Thanks to Ken and cn10012t6 for your plentiful pointers towards getting
the board to work.
Keith