/diy/ - Do It Yourself

>>1436534

if you're talking about DC currents, there are dedicated over-current detecting chips. or you can make your own using an op-amp and comparator. it's a very simple concept: you place a a 0.1-ohm resistor in series with the load, and compare the voltage across it against a 0.1V reference voltage. when it exceeds the reference, the comparator will flip to tell you you're above 1A.

AC over-current is usually detected using current transformers for safety.

ref: https://www.electronicdesign.com/power/prevent-system-damage-fast-accurate-over-current-detection