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Tone generator circuit

Simple, low component count tone generator. It can be adapted to create a morse code circuit, by adding a switch to the output.

How it works:

This circuit is based around the 555 timer circuit, used as an astable (free running) oscillator. The frequency (pitch) of the tone is set by the resistors and capacitors in the left side of the circuit. The first one is a potentiometer (variable resistor), this is our pitch control, which is basically all the external components you need. The capacitor to the far left is to reduce as much noise or undesired operation of the potentiometer, getting a smooth pitch change when adjusting.


You can find the timer's datasheet by following the link: 555 timer

Welcome To Electronic Circuits For Beginners!

All circuits included here are recommended to be assembled in printed circuit boards. Printed circuit boards, or PCB's increase the circuit reliability and mechanical stability.

Circuits quick links:

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Simple FM Transmitter

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Led Flasher Circuit

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Quadrocopters for beginners

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Voltage follower circuit

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Beginners Audio Amplifier

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Led chaser circuit

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Tone generator circuit

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H bridge circuit

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Simple power supply

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Beginner Electronics mini course index

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All circuits include parts list and complete How-it-works for beginners and hobbyists to easily understand.