This automotive circuit was obtained from an 80's schematic from the integrated circuit factory itself. The voltage regulator is still common, but the operational amplifier is of the time.
Found in a 1980s documentation, this circuit detects when the voltage drops below 11 V. Other...
This is a commercial circuit from a Japanese publication from 1972. The circuit uses a FET that...
In this circuit we show how to modulate the pulses produced by a 555 in frequency. The circuit can be...