MS20 envelope generator retrigger

Dimitree · Joined: Feb 09, 2011 Posts: 19 Location: Italy

hello
I'd like to mod this envelope generator (from the MS20) so that I can retrigger it, so that it would work like on this picture:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

is it possible? how?

this is the schematic:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

cyclic · Joined: Mar 15, 2015 Posts: 95 Location: hobart

Links don't work for me!

Can you use an inverting op amp so that when the decay falls below a set point (say 0.5v) it shoots a positive pulse through a cap to retrigger?

Dimitree · Joined: Feb 09, 2011 Posts: 19 Location: Italy

I'm sorry for the links, please check now, I fixed them.

I think your suggestion works if I'd want to loop the envelope, but what I want is to retrigger it with a trigger input, just like shown in the first picture

cyclic · Joined: Mar 15, 2015 Posts: 95 Location: hobart

Well, that schematic doesn't seem to have a gate input, just the trigger, so can you AND your Gates and triggers together then send the ANDed output to the trigger input?