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

[Rutger Vlek]

Hi all,

Interesting topic! It's only remotely related, but I've always been wondering whether a ringmodulator (balanced modulator) could be constructed from a simple VCA and an analog switch that flips the polarity of the signal. So, let's say you have a modulator signal between -5 and +5 volts. When the signal goes from 0V to +5V it opens the VCA in a normal manner. When it goes from 0V to -5V the modulator signal is inverted (turning it into 0V to +5V) so that it opens up the VCA in exactly the same way as it would, but the VCA output is inverted too. Has anyone ever tried this? I believe with sufficiently fast switching and a reliable comparator, it should work.... You could even make the switching and comparator circuits part of a companion module that combines with a VCA of your choice...

Best,

Rutger




On 13 feb 2014, at 21:27, Jean-Pierre Desrochers wrote:

> Would it be a good idea to use the venerable SSM2164
> for a ring modulator project (dual, quad)?
> The modulation could be log (by default) or lin
> with some tweakings..
> I could also use the AD633 but I'm just wondering.
> I already have plenty of 2164 chips so..
> 
> JP
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