A Metronome is a device used in the music industry to indicate the rhythm by a 'toc-toc' sound.
This circuit uses the 555 timer in an Astable operating mode
and generates a continuous output via Pin 3 in the form of a square wave. This is then passed through the 22µF electrolytic capacitor to create a smooth oscillation which then creates the 'toc-toc' sound. The speed of the output is controlled by the 250K Potentiometer (VR1).
1x - NE555 Bipolar Timer
1x - 1K Resistor (1/4W)
2x - 22µF Electrolytic Capacitor (16V)
1x - 250K Potentiometer
1x - Loudspeaker (8 Ohm)
1x - 9V Voltage Battery
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