CA3080 is the same chip as LM3080.
You have a problem with a feedback resistor somewhere. One of them is too
high a value, or has a bad joint. It could be the 100k around IC5a, any of
the 10ks on IC5b,c,d, and possibly, but not likely, the 10k around IC4c. I
would start with the 100k and work backwards along the chain.
Ken
oscilloscope, but with a fixed voltage or an lfo on the triangle input, the
output switches between +/- 15 volts, nothing in between.
first. The output voltage just switches between +/- 15 volts, but it does
fold the original waveform, so that switching occurs at different points of
the waveform. if that makes any sense
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
You have a problem with a feedback resistor somewhere. One of them is too
high a value, or has a bad joint. It could be the 100k around IC5a, any of
the 10ks on IC5b,c,d, and possibly, but not likely, the 10k around IC4c. I
would start with the 100k and work backwards along the chain.
Ken
>The main folder section triangle and pulse outputs are identical. They areboth outputting what I think is a 'squared' output. I don't have an
oscilloscope, but with a fixed voltage or an lfo on the triangle input, the
output switches between +/- 15 volts, nothing in between.
>and folds cv sections are working correctly, which is what tricked me at
>The pulse width modulation section doesn't effect the output. The offset
first. The output voltage just switches between +/- 15 volts, but it does
fold the original waveform, so that switching occurs at different points of
the waveform. if that makes any sense
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>