4N32 Relay Driver
4N32 Relay Driver
(OP)
I want to use a 4N32 opto to drive a 5v relay coil (200 ohms) from a 24v source. Can I just divide down the 24v with a resistor tied from the 4N32 collector to the 24v and take the output from there with the 4N32 emitter to ground?





RE: 4N32 Relay Driver
A better apporach would be to use the opto to drive a switching transistor that in turn controls the relay. This would avoid problem number 1, but you would still need to have a solution to provide the proper voltage. Perhaps you could use a small 3 pin Vreg or a zener diode. The relay will be somewhat tollerant of the input voltage, but it will still need to be about 5V.
RE: 4N32 Relay Driver
RE: 4N32 Relay Driver