Found in General Electric's 1966 documentation, this circuit uses company reference diodes, which are uncommon today.
This receiver is from an old English magazine from 1965. The transistors used are germanium, no...
This circuit fires emitting sound when light hits the sensor. The adjustment can be a...
This charger is from an old publication of 1975. The PNP transistor can be the BC558 and the NPN...