Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control the SCRs driving phases. SCRs can be equivalent current types.
We found this circuit in an article in Electronics Now magazine from November 1997. The circuit uses...
This circuit provides just over ½ W to a small speaker. We found this configuration in an old...
In the figure we have a typical relaxation oscillator with a SIDAC as well as waveforms and...