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BMC030 - Guitar Input PCB | Barton Musical Circuits

BMC030 - Guitar Input PCB | Barton Musical Circuits


This module provides an input point for external instruments to your modular system. It can be used with guitar, bass, keyboards or other audio. It requires no special parts to build. The PCB has MOTM and Eurorack style power connecters.

This is a PCB only suitable for multiple formats.

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Availability:In stock

This module is designed to provide an input/output point for guitar and other unbalanced external signals into a modular synthesizer patch. It has the following controls/inputs/outputs:


  • Gain Knob – This knob controls the gain of the initial pre-amp.
  • Gain Switch – This attenuates the signal before the initial pre-amp. When active, the gain range is 1-1000, when deactivated, the gain is .2 – 200.
  • Envelope Sensitivity Knob – This knob controls the “release” of the envelope output.
  • Gate Sensitivity Knob – This knob sets the threshold for the gate output.
  • Return Volume Knob – This knob attenuates the signal going to the return jack.


  • External Input – This input is where you plug in your guitar or other external signal. This is an unbalanced 1/4” input.
  • Return Input – This input is for whatever you'd like to send out of the “Return Output.”


  • Audio Output – This is the amplified audio sent into the external input.
  • Envelope Output – This is a rectified and filtered version of the audio, useful as control voltage.
  • Gate Output – This is a +5V/0V pulse, useful for triggering things like A/R generators
  • Return Output – This is an unbalanced output.
  • Square Output – This is a +/-5V audio pulse output.
Additional Information
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Brand Barton Musical Instruments
Additional Resources Build Guide
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