[sdiy] Cool 'ring modulator' schematic

[Jaroslav Lukes]

> diy at dropmix.xs4all.nl] On Behalf Of harrybissell
> in the latest issue of Electronic Design (under Design Briefs)
> 
> This is an opamp based design... it would be above the ARP
> 'exclusive or' design but below most true four quadrant
> designs in terms of functionality.
> 
> READ the last paragraph... note the schematic says "rf"
> but in reality... 'radio frequency' in this design
> is probably not more than 10KHz   :^P

It is redesigned and modernized cross modulator design (original czech
invent from the 50's).

Few years ago I was send scan to someone here. But now I does not have
functional scanner nor schematic by hand, so archive or somebody might help
you if you want it.

I have book with cca 20 pages of theory about this design (it could have
many variants).

Regards JL.