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Simple 555 timer circuits

Free simple 555 timer circuits electronics projects with explanation and diagrams. Huge collection of electronics projects based on the 555 timer circuit or equivalent integrated circuits.

555 timer circuit Light dependent tone generator

A very simple 555 timer circuit Light dependent tone generator is presented in this circuit diagram . What is so special at this 555 timer IC project ? this circuit use a LDR ( light dependent resistor ) to modify the frequency of the circuit . If the circuit is placed in a constant light the speaker will emit a sound with a constant frequency but we change the intensity of the light the circuit will generate a sound with a frequency that depends of light intensity .  If the tone generator circuit is placed in a dark place the circuit don’t emit any sound .

US police siren circuit using 555 timer

The US police siren circuit presented in this schematic is an alarm circuit which produce the sound of the US police .

Electro muscular stimulator circuit

This electro muscular stimulator circuit is based on a 555 timer circuit. The transformer must be an 220 to 12 volts at 100-150 mA and is reverse connected in circuit.


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