[sdiy] Chris MacDonald "Balanced Modulator"

[Needham, Alan]

Could I make so bold as to compare this to the ETI 4600 synth VCA/RM
module, they are similar (but not quite identical).
            http://www.eti4600synthesiser.org.uk

The 4 quad modulator is AC coupled on both inputs, by DC coupling one
input (the CV in) it becomes a 2 quad modulator or VCA (could that be a
clue to your seeing a VCA-like behaviour?)

As for Ken Stone's article (http://cgs.synth.net/modules/cgsrr.html)
I had forgotten the old name of "twisted ring modulator" until I saw his
diagrams!

	Alan


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
alfred.pear at gmail.com
Sent: 12 March 2009 02:35
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] Chris MacDonald "Balanced Modulator"

Has anyone built this?
http://www.evenfall.com/diy/balmod.pdf

I'm not hearing strong sidebands that one might expect from a ring
modulator...it seems more like a VCA..

Any reports?

-A
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