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 circuit was obtained in a Electronics World of 1968. The transistors can be equivalent as the BC558...
This 1967 General Electric circuit makes use of an array of 3 (integrated) transistors for an...
This converter has coils according to the reception and converted frequency bands. We found it in...