This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The supply voltage depends on the operational amplifiers used.
This simple circuit that interrupts the supply of a 12 V load in the event of an overvoltage was found in...
This source circuit, published in 1988, incorporates a timer with integrated circuit 555. In this...
This circuit is intended for the production of an audible signal from the capture of a continuous...