Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of Radio Electronics magazine. The indicator is analog, and the power supply must be symmetrical.
This circuit warns when the headlight bulb is on. We found it in a Popular Electronics from the...
This circuit was found in a 90s EDN. It activates a protection relay in case of reversing the...
This circuit can work with both TTL and CMOS circuits depending on the power supply. The circuit is...