Found in RCA documentation from the 90s, this circuit uses components from that time. CA3019 is uncommon today and can be replaced by discrete diodes.
This charger is from an old publication of 1975. The PNP transistor can be the BC558 and the NPN...
The transistor in this circuit can be replaced with any general-purpose equivalent. The time...
This circuit, using a unijunction transistor (UJT), converts a voltage applied to the input in a...