Relay Driver Circuit Using Transistor. Now a question arises why do we need the extra bit of circuit to drive the relay. If we use a relay with a rated voltage of 110vac we must feed it 110v from an ac power source.
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The emitter is grounded. So we are now going to find the. In the circuit below is most transistor relay driver circuit.
The relay is connected between the positive rail and the collector of the transistor.
The relay is connected between the positive rail and the collector of the transistor. In the circuit below is most transistor relay driver circuit. We again feed the ac relay the ac voltage it is rated for. By adding a 470 uf electrolytic capacitor at the base of the relay driver transistor a short lag can be induced so that the transistor switches on only if the input signal is persisting.
