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Tunable Transistor Organ Circuit

A simple electronic circuit that you can use to play tunes.. because it's a transistor-based electronic organ

Screenshot: Tunable Transistor Organ Circuit

This is a cool schematic for a circuit that uses a total of 3 transistors to create organ sounds. The circuit diagram includes instructions for how to tune the sound frequencies that the circuit plays. There are a total of either buttons that play sounds!

It's also possible to hook up a foot pedal via. relay so that you can change the circuit's octave during a session. the circuit operates on 9 Volts DC, however it can draw significant current at full volume, so it may be advisable to used a smoothed and regulated DC power supply instead of a battery if you want to run this at full volume!

Component Values:
  • R1-R8 - 250K Trim Or Regular Pot
  • R9, R12 - 100 Ohm 1/4 W Resistor
  • R10 - 10K 1/4 W Resistor
  • R11 - 220 Ohm 1/4 W Resistor
  • R13 - 5K Pot
  • C1 - 0.01uF Capacitor
  • C2 - 0.1uF Capacitor
  • Q1 - 2N4891 Unijunction Transistor
  • Q2 - 2N2222 Transistor or 2N3904 Transistor
  • S1-S8 - SPST Switch
  • SPKR - 8 Ohm 2 Watt Speaker
  • MISC - Wire, Circuit Board, Knobs For Pots
Alternate References:
terry says: (February 25 2008, 8:59pm)

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