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ES37 - Quantizer

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The ES37 provides a simple means to turn any control voltages in to voltage steps corresponding to well tuned (equal-tempered) tones of musical scale. It is scaled to 1V/Octave so a 0V to +5V envelope at one of the inputs produces a staircase of voltages corresponding to a chromatic scale.

If patched to the 1V/Octave input of an oscillator tuned to 'E', a slope of 1V applied to the input will produce the following steps of musical scale:-

(Normal chromatic scale)

If the 1/6 Scale Select is enabled, then the scale produced will be:-

(whole tone scale)

If the 1/3 Scale Select is enabled, then the scale produced will be

(scale of major third steps)

If both the 1/6 and 1/3 Scale Selects are enabled, then the scale produced will be:-

(Alternating half-step/minor third step)

Since the Scale Select inputs can be activated very quickly, the ES37 can produce a wide variety of tonal effetcs, quickly moving between four different types of musical scales (chromatic, whole-tone, augmented triad, and a six-step major-minor scale often heard in certain oriental music).

Accuracy of the ES37 is 3-cents maximum deviation from the ideal equal-tempered semitone over a 5-octave range while the response time for all channels is about 8 milliseconds.


Module Width
Module Depth
+12V @
-12V @
User Guide
Bill of Materials - 3.5mm - 4mm
PCB Overlay
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