Ring Mod circuits

[jhaible]

> Anyone got a good and cheap ring mod circuit on their web page? One that
> doesn't use specialist components preferred.

Sure. Look at  
<http://www.synthfool.com/diy/hj.html> 
or 
<http://www.it.kth.se/~e93_mda/synths/friends/haible/>

go to the schematics section; it's the first entry.

Build around a cheap CA3080. Cheap for sure. But is it good ?
You might go for a LM1496 (application from data sheet),
or for a RC4200 (Barry Klein's Book) for more precision
(notably less temperature drift), but using a simple 3080
is not as bad as it might look like. The circuit is designed
to produce very smooth distortion when overdriven, too.

JH.