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Active Real Ring Modulator
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3D Model 3D Model (full assembly)

Please note: This is not a guitar effect where you can "plug in your guitar and get a sound out". Extra circuity is absolutely essential, either directly wired, or as part of other equipment. If you need to ask how to use it, then it's not for you.

Four quadrant multipliers have more or less replaced ring modulators in synthesizers, even though they still bear the label "ring modulator". The distortion in these is lower than that of a true diode ring modulator, because the diode voltage drops have been eliminated. This leads to better specifications, though in a noise maker, this is not always desirable.

For years Ken has been building various four quadrant modulators, and has been satisfied with none of them. Not one of them had the raw sonic beauty of the traditional ring modulators I made when he was first starting out in synthesizer building.

For that reason Ken released the "Real Ring Modulator", a traditional diode and transformer ring modulator.

The pre-assembled units (now discontinued) were hand assembled using matched germanium diodes and a pair of 3k impedance transformers. Some even used diodes from a computer from 1969

Carrier suppression is good, but not complete, so a compressor-expander could help if better suppression is required.

The CGS367 is an updated version of the popular CGS302 - Real Ring Modulator, a traditional diode and transformer ring modulator. This time, a preamplifier for external input, and input and output buffers for conventional synthesizer levels are included.

PCB Dimensions: 1 " x 6" with 3.2mm fixing points 0.15" from the edges
Power Consumption: +12V @ -12V @

Article, art & design copyright 2003 by Ken Stone

Email:  elby-designs@bigpond.com
© Copyright 2000. All rights reserved.     Revised: September 17, 2021