This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the zener, the circuit can be used to monitor other voltages.
This circuit, which can be used as a shield, was found in General Electric documentation from the...
This small inverter that produces high voltage from a 6 V source was found in an American...
The PA222 integrated circuit used in this project from an American 1967 documentation is not...