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ES79 - Ring Modulator

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The ES79 is a variation on the 1973 Classic Serge R6 Ring Modulator.

Features include the following:-

  • A VERY CLEAN SOUND down to very low signal levels (unlike conventional modulators where distortion increases at low levels)
  • NO SQUELCH CTRCUIT IS REQUIRED due to the low noise characteristics, therefore annoying signal dropouts and"pumping" effects are totally absent
  • INTERNAL WAVESHAPING OF CARRIER to add to modulation effects

The sum total of these design improvements is a Ring Modulator capable of treating the most subtle acoustical signals, without the colouration typically associated with even the best previously available ring modulators.

The versatility of the ES79 is enhanced by the added feature of voltage and manual control of the entire spectrum of modulation possible: from zero modulation (i.e. the original, un-treated input signal) through amplitude modulation to full ring modulation. This allows many shadings of effect, manual or automatic with voltage controls.

The ability to control the Carrier level manually and through voltage control allows the output to be level controlled, as well.

Through the use of an internal signal processor for the Carrier, additional effects can be produced by waveform modification of the carrier signal. When the module is set to full, ring modulation from the lower knob or voltage control, the output signal contains the sum and difference frequencies of the Signal Input and the Carrier Input.

If both signals are pure sine waves (only one frequency component), the output will be a composite signal consisting two frequency components: the sum and the difference frequency of the Signal and Carrier. If the Carrier level is increased beyond the mid-position, then the carrier waveform will become slightly rounded, and new frequency components will be produced. Each of these new components will also modulate with the Signal input to produce a sum and difference frequency, and the output signal will become richer in harmonics. This effect is unique to the ES79 and allows another dimension in timbral modification .

The ES79 provides a means to smoothly voltage control the index of modulation, from 0% modulation of the signal by the carrier, through to 50% modulation (otherwise known as amplitude modulation) and 100% ring modulation with excellent carrier rejection. 

The possibilities are endless for musicians interested in programming subtle changes in harmonic content created through the modulation of two signals by each other. 

When not needed as a Ring Modulator, the module offers itself as a spare VCA, fully log-linear like its cousin the ES78 VCA (but not as versatile). 

Doug Lynners Patch of The Week

Module Width
Module Depth
+12V @
-12V @

Build Guide

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