[sdiy] SSM2164 to use as ring modulator...

[Needham, Alan]

The ETI4600 VCAs had a switch to select VCA or RM.
If I remember correctly, it simply AC coupled the VCA control voltage input, sounds OK to me.


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Olivier Gillet
Sent: 14 February 2014 11:00
To: Neil Johnson
Cc: synth-diy
Subject: Re: [sdiy] SSM2164 to use as ring modulator...

> Oh, and as for a ring modulator, use two gain cells to make a Irwin 
> linearised VCA and then with a couple of opamps you can make your ring 
> modulator.  So a single 2164 can make two ring modulators.

I'm curious about how this could be achieved with just a linear VCA.
By adding a DC offset to the modulator so that it remains positive, and then removing the corresponding fraction of the carrier from the output?
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