Attack decay envelope generator

[Oweng4000]

Hello This is my first post here.

I was just wondering if anyone had any designs for a simple envelope generator with attack and decay only. I really don't need release as my circuit doesn't store pitch information.

Thanks,
Owen

[mikebike]

realese doesnt have any thing to do with picth, atleast when your only using it to control amplitude.

check this out:
http://en.wikipedia.org/wiki/Sound_envelope

[Oweng4000]

realese doesnt have any thing to do with picth, atleast when your only using it to control amplitude.

check this out:
http://en.wikipedia.org/wiki/Sound_envelope

What I meant is that when i release the key, The sound cuts out

[mikebike]

wait were not talking about a midi controller are we?

on not is it a toy keyboard?

if so you will have to modify the envelope circuit in the keyboard, if it is modifiable at all.

whats the model?

[Oweng4000]

I'm actually diying a ribbon based synth.

[expanoncolin]

There are plenty of designs if you google AD envelope generator, or similar keywords.  This may be the simplest: http://www.bridechamber.com/IF_EG_PCB_files/adar_board_doc.pdf  You can omit the lower half of the circuitry - everything connected to the right side of R22.  That's for converting audio signals to gates.  If you send a trigger (narrow pulse) to the T/G input, then you should get an AD response.

-Colin