We found this circuit in the November 1984 Radio Electronics magazine. The base frequency is given by C1. The power supply can be between 3 and 12 V.
This circuit controls a fan in the car, according to the temperature, activating it automatically when the...
This symmetrical power supply uses regulators from the 78xx and 79xx series and can be adapted to supply...
This highly sensitive circuit was found in a 1967 General Electric SCR manual. Equivalent...