This board plugs directly into the Arduino board and provides 25 multiplexed keys (2 full octaves), 4 pots, status LED, reset switch, digital to analog converter IC, and an RCA audio jack. The Arduino board with its powerful AVR processor is more than adequate for a wide range of sound synthesis techniques. We have experimented with simple additive / wave-table synthesis, frequency modulation, ring modulation, sampling, polyphony, and various arpeggiators. The whole thing can be powered over the Arduino’s USB port for convenient experimenting. (Arduino not included.)
The board is designed to mount easily to 1/8″ panel material, and 1/2″ round keys can be made out of wood or plastic. Open source rock!
- 25 keys and multiplexer circuitry
- 4 potentiometers; 1 controls output level
- Microchip MCP4921 12-bit SPI DAC
- Passive low pass output filter