william.b.fox wbf at aloft.att.com
Wed Nov 8 15:04:55 CET 1995

Juergen wrote:
> I want to build a frequency shifter. I need cheap, precise and
> small 4-quadrant multipliers in order to keep pcb space low.
> I can't get an AD533, but there is this RC4200. Does anybody
> have experience with this one? The specs sound nice ...

Are you building an analog frequency shifter?  If so, I'd love to see
the schematics for your Quadrature VCO and All Pass Filter that splits
an input into a quadrature output!  Ever since I learned of the concept,
I've dreamt of building a frequency shifter.  In fact, I'd like to see
schematics for 4-quadrant multipliers and VCAs using modern components,
too.  (Haven't been into it since the late '70s but getting back to that
mind set quickly!)

Bill Fox	wbf at aloft.att.com

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