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.
Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load....
This Intersil circuit was found in a 1980s documentation. Operational are of the time, but current...
We found this circuit in a 1980s American publication from Motorola. Modern equivalent transistors...