highly inspired by MOTM830 mixer structure with an additional
voltage comparator integrated and normalised on the second
mixer channel. Bias can be set on Mixer2 output or assigned
to the comparator input. No capacitors on I/Os unless those
required to stabilise OPAs . It work really fine, low drift
/offset and hi slew rate aop required :-) Pcb is homemade
double side made with my "varnish top side before assembly"
method . The front panel it is Schaeffer...
a picture galery ,clic on them to to view in big.