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CIRCUIT DIAGRAM

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Page 1: Relay switching

CIRCUIT DIAGRAM

Page 2: Relay switching

CIRCUIT DESCRIPTION

The circuit is simple NPN transistor common emitter switching circuit. The transistor T-1 is supplied through negative at emitter. The base is conducted through the port output from computer and collector gives output to energies the relay commonly connected to +ve supply. The diode prevents back emf produced by relay while working.


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