[sdiy] CMOS Switch as VCA?

[HOSHUYAMA]

Hello List,

Inspired by the discussion here, I designed a VCA 
using CD4016 where only an NMOS in a transfer gate is used.

http://houshu.at.webry.info/201002/article_2.html

Unfortunately, it requires an unbuffered 4016, but I don't have one.
The schematic shows just the idea of trick, though it is tested on LTspice.

> Also interesting: The different circuits from Osamu Hoshuyama also on this page 
> (4007 VCA for example).

It has CV feedthrough with temperature drift.  Don't expect high performance.  
I'd add DC feedback to reduce CV feedthrough.

Best regards,

Sam HOSHUYAMA
Saitama, JAPAN


Ullrich Peter wrote:
> Maybe the old EFM design could be interesting using the 4049:
> 
> Schematics can be found here:
> 
> 
> http://electro-music.com/forum/topic-37638.html
> 
> To understand this very special circuit (VDD and VSS connected!) you need to have a look at the explanation diagrams at the end of the page.
> 
> Also interesting: The different circuits from Osamu Hoshuyama also on this page 
> (4007 VCA for example).
> 
> Ciao
> Peter
> 
> 
> http://come.to/synpro
> 
> http://go.to/datadial (Synth Addon)