![]() VCE(max) must be at least grater than 2 times the Relay operating DC voltage. ![]() If we consider worst case we should give 1V extra to the Relay coil circuit so that sufficient amount of voltage is provided to the Relay coil. As my relay works on 5V DC so to find the coil current which is basically ic ( collector current ) we need to measure the resistance of Relay coil.īut if I say there will be one more voltage drop in the path of this current that is VCE (collector Emitter junction drop) which is 300mV-1V(datasheet). So we are now going to find the threshold current to drive a relay properly. Step-1: Finding the minimum current required for energizing the relay coil So let’s go through different step to design a better Relay driving circuit.
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