[sdiy] 4069UB based CV-ADSR

[tomg@efm]

Very cool Magnus..I think it's very close to working! Pins 1,5 and 11 
need to be held close to gnd so the fets have a drain. Maybe a 470ohm 
- 1K resistor on each? I think 1M is too low for feedback and too high 
for input maybe 2.2M and 100K. Those 1K resistors might kill your 
voltage level so maybe use those extra inverters to bring the level back 
up before the output stage..

I really don't know for sure I'm just throwing things out there. The concept 
looks sound. I think it's gonna work with a few small modifications.Well 
done! Your gray matter is as sharp as ever. 

Tom



> Dear all,
> 
> > Biten by the 4069 bug I came up with a general idea for an 4069UB only
> > based envelope generator. As it happend, it just happend to have CV
> > input for the ADSR parameters.
> > 
> > The current version, v0.1, is just a first attempt to draw something
> > up. It is doomed to not work and is not tested. I provide it only as a
> > basis for some discussion and let some people get the oppertunity to
> > voice oppinions.
> 
> I forgot the link...
> 
> http://home.swipnet.se/cfmd/synths/schematics/4069-CVADSR.ps
> 
> Cheers,
> Magnus
>