4069 Envelope Follower

synthmonger

You all might find this useful. I tested it out and it works well. You can get a reverse sweep by running one more gate at the end.

http://experimentalistsanonymous.com/diy/Schematics/ADSR%20Generators%20and%20Envelope%20Generators/CMOS%20Envelope%20Follower.bmp

RF · Posted: Sun Feb 22, 2009 12:24 pm Post subject:

Thanks for posting that synthmonger - looks interesting.

bingmachine · Joined: Jan 23, 2009 Posts: 19 Location: Sweden

And what is the expected input signal peak-to-peak for this to work well?

/Erik

synthmonger · Posted: Sun Feb 22, 2009 5:20 pm Post subject:

Haven't checked. I used a guitar and casio VL-1 which worked.

bingmachine · Joined: Jan 23, 2009 Posts: 19 Location: Sweden

That's all I need to know. Sounds great! Thanks!
All we need now is that single supply version of the Wasp-filter. Wink

/Erik Forsling

DGTom · Posted: Sun Jun 21, 2009 5:12 pm Post subject:

I breadboarded this yesterday, & it works pretty nice, I didn't have (nor did the local supplier) any 2M2, so after gettting it up & running with 2 x 1M + 200K I replaced the 2M2 w/ a 1M pot, played a little bit with adding resistors to the pot (1M, 200K - even tried a 4M7!) but just the pot alone seemed to work best.

I am getting quite alot of voltage on the output with no input - guessing that is normal, I have a diode on the input as well, just in case, what I wonder is could you put an op-amp on the in or out to clean it up a little? I quite like the basic way the cct. works, you can hear the cap discharging in a nice bubbly way & the pot gives quite good control, from zero following to overlapping, not getting every peak smoothed out following.

Might just put a pot as a voltage divider on the output again so you can adjust the output.

Any tips or ideas from anyone else who played around with this cct. would be great Very Happy

synthmonger · Posted: Sun Jun 21, 2009 7:45 pm Post subject: