[sdiy] multiplier questions/experiments AD633

Harry Bissell harrybissell at wowway.com
Wed Oct 27 20:32:23 CEST 2010

If you take a four-quadrant multiplier, and feed it two
audio rate signals, it makes a great "ring modulator"


H^) harry

----- Original Message -----
From: dan snazelle <subjectivity at hotmail.com>
To: synth-diy DIY <synth-diy at dropmix.xs4all.nl>
Sent: Wed, 27 Oct 2010 14:26:28 -0400 (EDT)
Subject: Re: [sdiy] multiplier questions/experiments AD633

its interesting, these circuits are coming out FUZZED.

I will try some control voltages and see if they work better than AUDIO.

of course I want to see what else is possible with multipliers....going through the non-linear handbook looking for stuff...any ideas?


On Oct 27, 2010, at 2:12 PM, Tim Parkhurst wrote:

> On Wed, Oct 27, 2010 at 8:24 AM, dan snazelle <subjectivity at hotmail.com> wrote:
>> so i setup some ad633 circuits this morning.
>> However, to my surprise, many of the circuits shown (squaring, doubling,  inverse functions) don't really do that much to synth waveforms.
>> I was feeding the Ad633 with various waveforms.
>> SO if anyone here has a lot of experience with multipliers or with the 633, I'd love to know if square root, division, etc circuits have a place in the synth world.
> I agree with Tom, try feeding in a couple of sine waves and then
> listen for differences. Other waves (saw, etc.) probably give too much
> harmonic content at the output (who would have thought that could be a
> bad thing). Still, my bet would be that they are going to all sound
> very similar. Where you might see some differences would be with LFO
> signals and control voltages. Are the circuits DC capable?
> Tim (it's hip to be squared) Servo
> -- 
> "Sire, the church of God is an anvil that has worn out many hammers."
> - H.L. Hastings

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