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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.

US police electronic siren circuit

A very simple police electronic siren can be built using electronic diagram below. This electronic siren uses electronic components and produce a Kojak character sound .

Circuit Diagram: 
US police electronic siren circuit using 555 timer

555 timer circuit metronome

Using a 555 timer circuit and a few electronic components can be made very simple metronome. Timer 555 circuit is connected to circuit as a astabil multivibrator and produces regular pulses that can be heard in a speaker. Metronome pulse frequency can be adjusted with the 220k potentiometer. The circuit requires a supply voltage of 9 volts DC power supply( can be used and a battery). If is used a speaker with an impedance of 8 ohms must be connected a series resistance of 1 watt.

Circuit Diagram: 
555 timer circuit metronome

555 timer circuit DC motor speed control

A very simple 555 timer circuit DC motor speed control electronic project can be designed using this circuit diagram. This 555 timer circuit DC motor speed control project is very simple and require few external electronic parts . Using this circuit you can control speed of a 6 volts DC motor, by simply rotate left or right the 50 k potentiometer.
The speed of a motor can be adjusted by this circuit, from 5% to 95%. The entire circuit must be powered from a simple 6 volts DC power supply .

Circuit Diagram: 
555 timer circuit DC motor speed control

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