This circuit for old flashes with xenon lamps was found in a Radio Electronics magazine from June 1966. The sensor is a photoelectric cell from the time. Power is supplied by a 9 V battery.
This is an amplifier with one of the first integrated circuits available, the CA3020 which was...
This circuit was obtained in a 1964 Electronic Design. The transistors are from the era and the...
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...