DIY SH-101 like Sub-oscillator (SUB 101A rev.2) for any Modular or semi-modular synths


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The SUB 101A (rev.2) is available as a PCB, as KIT (PCB + Parts) or fully build (with enclosure for desktop use or panel for Eurorack).

If you don't have a Eurorack, but want some juicy low end with this Sub-Oscillator you can build it, put it in a box and enjoy it with your semi-modular synth (like the Moog Mother 32, Behringer Crave, Neutron).

This little fellow runs on 9V battery or 12V power supply.

I put together a circuit that adds a square wave sub-oscillator to your semi-modular synth for some really beefy tones

This Sub Oscillator tracks an oscillator signal from a VCO and generates a square wave at -1 or -2 octaves below. Works best with sawtooth, triangle, Sinus waveforms or simple square waves.

There’s a pot that mixes between the 2 sub-octaves and if you set it to 50% it sounds just like the famous Roland SH-101 pulse sub-oscillator.

For this to work, you need to route the oscillator output of your synth into the sub-oscillator Input. Then you get the sub-oscillator signal at the output. Mix it back with the original through an audio input chanel to enjoy that juicy low end.

This PCB is safe RoHs compliant (Lead Free).

Due to the Covid situation, I decided to send all the packages in "priority mode" to deliver them as quickly as possible. But some delay may occur.

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