real ringmod

[Martin Czech]

Someone asked for a ringmodulator explanation :

Try : "http://www.synthfool.com/ringmod.html"

It is not so obvious in the schematic, but the four diodes
form a "ring", that's why the name. 
The circuit is of course very nonlinear, but it approximates a four
quadrant multiplication, and that's what ring mods usally do in the time
domain. Only the HF-people do it that way today, the rest uses
diff gain stages for multiplication, so the term "ringmodulator"
is used for historical reasons only.

m.c.