This circuit is from a factory manual from the 80s. The circuit can be implemented with modern operationals. The supply must be symmetrical, and the diode is general-purpose.
This circuit that uses only transistors indicates when the voltage in the circuit has the voltage...
This circuit detects the 60 Hz signal from the power grid captured by an object, activating a...
Although it is a common configuration today, this circuit was taken from an old publication. The...