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BMC013 - Random Resonator PCB | Barton Musical Circuits

BMC013 - Random Resonator PCB | Barton Musical Circuits


This is a somewhat minimalist module used to alter the timbre of an oscillator. There is a blend knob which lets the user select how much of the original oscillator is present, and a complexity knob controlling how complex the new timbres being added might be.

This is for a PCB (including programmed microcontroller) only suitable for multiple formats.

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Availability:In stock

This module is inspired by Bernie Hutchins "Cascaded-Monostable Type Generalized Resonator" which he described in Electronotes #93, September 1978. This circuit took an incoming VCO signal and whenever the signal transitioned from negative to positive it triggered a series of short pulses. The Random Resonator does this as well, but with a very big difference. The CMGR had 4 pulses, each of which had a control for it's amplitude and it's length. The Random Resonator selects amplitudes, lengths and the number of pulses completely at random.


  • Blend Knob - The blend knob is used to select what mix of the original signal and the resonating signal gets sent to the blended output.
  • Complexity Knob - This manually controls the "Complexity" parameter. "Complexity" is actually controlling three separate parameters; possible output levels, maximum number of steps and maximum length of a single step. When the complexity knob is turned counter clockwise there are less possible output levels and a lower maximum number of steps, but a longer maximum length. When turned clockwise, the opposite is true.
  • Loop switch - This switch toggles whether the resonator will repeat the series of pulses at it's end or not.
  • New Button - When this button is pressed a new random series of pulses is generated. The complexity level of the new series of pulses depends on the setting of the knob when the button is pressed.


  • Wave Input - The output from a VCO or other part of the synthesizer should be input here.
  • New Trigger - A gate or trigger signal on this input will perform the same function as the New button.
  • Complex CV In - To use an LFO, sequencer or other CV generator to modulate the complexity level, input it to this jack. There is an attenuator associated with this input.


  • Wet Output - This is the direct output of the series of pulses
  • Blend Output - This output is a mix between the pulses and the input signal.
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Brand Barton Musical Instruments
Additional Resources Build Guide

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