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This is a simple ring oscillator.

Each of the three transistor circuit work as an inverter and the oscillation is made possible with a feedback loop.

Parts: general purpose bipolar junction (BJT) NPN or PNP transistors - 5 (you might need spare just in case), 10 kohm resistor - 5, 100 ohm resistors - 5, 1 kohm resistors - 5, 470 uF capacitors - 4, matrix board - 1 (10 cm by 10 cm), insulated wires.

Tools: pliers, wire stripper.

Optional parts: solder, heat sinks, heat transfer paste.

Optional tools: soldering iron.”

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