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Electronic circuits that use the 555 Timer

555 Timer Circuits

555 Timers are fun and a great way to start learning electronics

Metronome Circuit


A Metronome is a device used in the music industry to indicate the rhythm by a 'toc-toc' sound.

Overview

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 22F 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).

Schematic

Metronome Circuit

Parts List

1x - NE555 Bipolar Timer
1x - 1K Resistor (1/4W) 2x - 22F Electrolytic Capacitor (16V)
1x - 250K Potentiometer
1x - Loudspeaker (8 Ohm)
1x - 9V Voltage Battery

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