An open-source DIY touch synthesizer


The Tiny TS is a credit card sized (100x65mm) fully open-sourced synthesizer with a 1-octave capacitive touch keyboard.
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 ENV mod. ENV: Attack and Release affecting amplitude.
An open-source DIY touch synthesizer
The synth is built on the ATmega328 MCU and is very easy to build as a kit.
The full circuit diagram is as below.
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
  • IC278L05 TO-92 5v linear regulator
  • C1100nF capacitor
  • C210uF capacitor
  • C310uF capacitor
  • C4100nF capacitor
  • C510uF capacitor
  • R11Kohm resistor
  • R31Kohm resistor

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