Fast analog sw. as VC resistor

brad sanders radioactive at geocities.com
Sat Jan 11 00:19:36 CET 1997


>That sounds promising but I have to confess that I didn't see the 
>schematics for a *discrete* VC ADSR yet, just CEM3310 stuff (e.g. in 
>Thomas Henry's book). Soooo- could you provide some schems or name 
>some sources for that (I have no acess to Electronotes :-(  ).

Welll, to be honest I've nver seen one, either. However, I did assert
"VC ADSR is easy" so I guess I have to put up or shut up.

OK, I spent about the last two hours "throwing" this thing together.
PLEASE understand I haven't prototyped one yet, but the circuit's
simple enough my now sleep deprived mind is convinced it'll work.
Feel free to give it a shot - just remember where you got it (provided
it works, eh?)

The biggest "key" I guess I should tell you is the comparator just
inverts the gate, compares the attack level, and latches the
"decay/sustain" bit low. The other comparator section turns the switch
"off" by jamming both addess lines low; when the input select is 00,
the output just tracks the input.

The other states select attack (gate=1, d/s=1), decay/sustain, or
release, and impart charge on the cap by just switching on/off, either
charging to VCC, sustain voltage, or ground. For best results the
0.33uF cap should be a low ESR device, like an OSCON or a tantalum.

Note that if you use a CV either above or below the amplitude of your
triangle, you can essentially "freeze" the states. This is either good
or bad depending on your POV; I prefer to call it a "feature." Also
note: NONE OF THE LINES ARE BUFFERED! To this schematic you can 
plan on adding two quad op-amps for buffering. As it is, we have
unprotected CMOS inputs, and the CV and gate lines are pretty heavily
loaded (1KOhm). Still, at four chips for a complete VC env gen, I
think it's a pretty low parts count device.

If you have any questions, just ask; we'll see if I can answer them
after I've had some sleep...


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