ADSR end trigger

Pehr

Would it be possible to add an end of cycle trigger when the release is finished on the MFOS ADSR?
That would be really good because I could use my 4 ADSRs as LFOs like the 281 Smile

First thought is to just ook up some MML cuircuit from Ray:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

(upper-right)

to the (R) point (U2-D pin 11) in this schematic:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Possible?

iopop3 · Joined: May 28, 2010 Posts: 95 Location: Malmö, Sweden

Cool idea, can not see why it would not work. Quite a few parts so it should be rather easy to test.

Pehr · Posted: Mon Dec 19, 2011 7:58 am Post subject:

iopop3 · Joined: May 28, 2010 Posts: 95 Location: Malmö, Sweden

Just do it! Very Happy

.. and report back your results.

Mongo1 · Joined: Aug 11, 2011 Posts: 408 Location: Raleigh NC

Let us know if that works!

BTW, I already used one of those spare invertors to drive an LED. I hooked one side up to the "A" signal and the other to the LED. Now I have nice blinky lights, and you KNOW how important that always is....

Gary

Pehr · Posted: Mon Dec 19, 2011 1:25 pm Post subject:

0k, after some investigation I've realised that the release phase does not end until the gate is high and the attack begins.

to be continued...

Pehr · Posted: Mon Dec 19, 2011 2:09 pm Post subject:

0k, I got it oscillating without modifying
Send the output to an inverter (CGS NOR) and then the inverted back to the trigger input.

However...

* it is an RC-envelope, thus RC-wave
* it is hard to control frequency at audio rates
* it is oscillating from 2V to 10V due to the input comparators

good enough for me Smile

Pehr · Posted: Tue Dec 20, 2011 4:51 am Post subject:

0k, it is possible to have an EOA-trigger out (End Of Attack) without massive modification.
That way I could get quadrature-ish CV combined with other envelopes. Smile

or HADSR if you like