Analog Drums (Modular Univox SR-55)

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Here’s a modular Univox SR-55, AKA Korg Mini pops 3. I’ve removed it from it’s odd-shaped case and reworked the circuitry to fit into my second modular synth cabinet. The pattern producing circuitry has been removed, as the drum machine has been fitted with proper trigger inputs.

Each trigger input uses a simple op-amp inverter to produce the negative polarity triggers this machine requires. By varying the pulse width of the trigger, different sounds can be produced.

This sequence is produced by a clock divider, as well as a sample and hold circuit.

See more at: http://seaweedfactory.blogspot.com

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