[sdiy] multiplier questions/experiments AD633

[Thalassa Pablo Penas]

The MFOS ring modulator is based on the AD633 and sounds really good.

http://www.musicfromouterspace.com/analogsynth_new/RINGMODULATOROCT2007/RINGMODULATOROCT2007.html




On the Ultimate Expander there is a simpler version of this circuit without the 
oscillator

http://www.musicfromouterspace.com/analogsynth_new/ULTIMATE_EXPANDER/ultexpanderpg2.html#SCHEMPAGE7




Pablo





----- Original Message ----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: Magnus Danielson <magnus at rubidium.dyndns.org>; synth-diy at dropmix.xs4all.nl
Sent: Wed, October 27, 2010 10:29:13 PM
Subject: Re: [sdiy] multiplier questions/experiments AD633

> > If you take a four-quadrant multiplier, and feed it two
> > audio rate signals, it makes a great "ring modulator"
> > sound...
> 
> Unless you have a DC offset on any of the inputs, which causes fairly
> severe leakages.

Yes 4-quadrant multipliers should always have the option of AC coupling on
the inputs.  I like to do it with a switch, so I can also use them for CV
processing.

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