Dummy Car Alarm

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Dummy Car Alarm

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.

The circuit opposite shows the modification needed in order to make the astable function as a simple flashing light utilising an light emitting diode. This has an on-off switch to turn the alarm on.

 

The modification shown below allows the circuit to turn on and flash the LED when the ignition in the car is turned off.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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