We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the time and the diodes in the dotted board must be mounted on the output transistor heatsinks.
This circuit was found in a NASA documentation from the 1980s. The components used are of the time...
This circuit, found in a 1994 documentation, uses 20 A 2N5448 triacs or equivalent and should be...
This circuit using a SIDAC as a relaxation oscillator was found in the ON Semiconductor manual for...