Re-inventing (?) the VC envelope ?

[jhaible]

> And perhaps using a 4052 as a stage switch? 
> And taking the + env out as as B input for switching to decay stage!! 
> And the gate input to the A input of switch! Both inputs zeroes
> makes release stage, A input high makes Attac stage, A and B input high
> make decay to sustain stage. Ans round we go again, Wheeeeeee!!! 

No CMOS switches here, at least for me. Three cheap npn transistors are
enough for switching the A, D and R CV's. Easier to layout, and less
problematic
with over voltage.
I have the circuit ready and simulated, but I won't publish it before it's
tested.
I just couldn't await to share the VCA core idea as soon as I had tested it
(;->)

But what do I say. Three switches aren't necessary at all. Just connect the
Attack CV to one base, and the other will be shared only by Decay and
Release.
So, only 2 transistors needed for switching.

If you're going to build a VC ADS (like Minimoog and many others), no
switching
is required at all. Just build the VC ADS circuit from my homepage, and
replace the 3080-based core with my new circuit.

I'm planning a full VC Hold-ADSR to be published on my homepage at some
time,
but I have to test it first.

JH.