Found in an Electronics World of 1968 this circuit can use any SCR and diodes depending on the load. The circuit is full wave and the unijunction can be 2N2646.
This circuit was found in Motorola's 1968 documentation. The SCRs are then replaceable with...
This temperature compensated circuit was found in a Popular Electronics of the 1990s. The circuit...
Suggested by a 90s EDN, this circuit supports almost any LED as a source and a phototransistor as a...