[sdiy] Yamaha CS15 envelope gen

[dan snazelle]

I am looking at the CS15 ADSR schematic. It looks very simple. I had assumed the envelopes were going to be on a chip like so many of the other yamaha circuits.

but these look to be simple BJT/FET/OPAMP circuits. Am I overlooking some complicated part ;)


has anyone built these? I was going to have a go at trying on the breadboard but wanted to see if anyone knew anything about them. I used to own a CS15 (in the early 90's) and seem to remember them 
being fine.


thanks