I am wanting to make a voltage selector, to select either 12 Volts or 24 Volts. So basically if the incoming supply is above 16 volts it switches out a relay.
I have seen circuits using a 741 as a voltage comparator. I am not sure how it measures the input voltage.
I have seen circuits using a 741 as a voltage comparator. I am not sure how it measures the input voltage.