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An open-source DIY touch synthesizer




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The Tiny TS is a credit card sized (100x65mm) fully open-sourced synthesizer with a 1-octave capacitive touch keyboard.An open-source DIY touch synthesizer

It has Audio/CV/Gate outputs and 6 synth parameter dials.

The CV’s output 1V/oct and Gate from the keyboard.

With the version 1.1 firmware it now also handles CV/Gate input from a sequencer.

The synthesizer parameter knobs includes: DCO: Coarse pitch and Double. The CV out follows the keyboard and coarse pitch. DCF: Filter peak and ENVmod. ENV: Attack and Release affecting amplitude.

The synth is built on the ATmega328 MCU and is very easy to build as a kit.

The full circuit diagram is as below.Schematic An open-source DIY touch synthesizer

It runs from 6 – 12v (9v battery) but can run down to 3v as well but the CV 1v/oct output is dependent on a 5v supply to the chip.

The PCB is very simple with 1-octave capacitive touch keyboard and a few passive parts.

The BOM for building it:

 

  • IC1 – Preprogrammed ATmega328
  • IC2 – 78L05 TO-92 5v linear regulator
  • C1 – 100nF capacitor
  • C2 – 10uF capacitor
  • C3 – 10uF capacitor
  • C4 – 100nF capacitor
  • C5 – 10uF capacitor
  • R1 – 1Kohm resistor
  • R3 – 1Kohm resistor
  • R4 – 1Kohm resistor
  • CN1-CN3 – 1/8″ Thonkiconn Jacks
  • P1-P6 – 100K lin Alpha 9mm potentiometers
  • The PCB

For more detail: An open-source DIY touch synthesizer

 

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