So I need an advise from wigglers - can I use this circuit or no. I just don't want anybody says 'He took not their and earn money on it'.
I made some changes in circuit. Now it works well on simulation.
- expo mode worked not correct (maybe it's a reason why Papareil removed it in his project). I made it in a different way.
- made amplitude 5V (was 6V)
- made sustain range 0 ... +5V
- will tweak attack decay release to have ranges: attack 0.1ms - 10s, decay and release 1ms - 20s.
This is schematic I simulated. No trigger input, sustain gate out and LEDs yet. I marked red parts I added or changed.
By analogy with other expo multipliers I think these 2K I marked yellow must be tempco. Don't know how to check this, will heat up a prototype and see ..

This is original schematic:

Scope shots:


Panel I wan to make. 22HP. I hope to place everything on one board.
