Question

Design a transistor based relay driving circuit to turn ON and Turn OFF a 240 Volt 50 Hz AC motor using the output of a microcontroller assumed to be 5v at 5mA. The circuit should included a 12V relay which requires 60 mA of switching current, assume the relay provides enough isolation between the micro controller and the 240 V supply. Detail all calculations relating to the transistors.

Answer 1

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