Dummy Car Alarm

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Dummy Car Alarm

The circuit opposite shows the modification needed in order to make the astable function as a simple flashing light utilising a light emitting diode. 


The cicuit is shown below of a dummy car alarm which flashes the LED when the ignition is turned off.

The Astable Multivibrator is a basic two stage amplifier with 100% of its output fed back in phase with its input. This results in a free running oscillator whose output signal is only limited by the power supply voltage rails.

The cicuit can be used as a clock pulse generator for logic circuits.

In this instance it is going to be used to form the basis of a "Dummy" car alarm.

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