The sensor of this circuit is a photodiode. Equivalent operations can be used, and the instrument can be replaced by the lower current range of a standard multimeter.
This small circuit for the medium or short-wave range, depending on the coil, was found in a...
Pressure switches are used in this circuit that quickly turns off the supply of a load if...
This circuit will trigger an audible warning signal after the end of the pre-programmed timing. Using...