Morse Code Practice Oscillator

Circuit Diagram

How to Build It

1. Build an audio oscillator using a BC547 transistor, a coil/capacitor or an RC network, to generate a continuous tone.
2. Connect the oscillator's output to a small speaker.
3. Add a push button (a telegraph key) in series with the circuit's power supply.
4. Power the circuit.
5. Press and release the button in Morse rhythm — the tone should sound only while the button is held.

Bill of Materials