This power control from a 1968 Motorola manual shows how to use a contemporary diac as a zero-crossing detector. The SCR is of the type depending on the power of the load.
With the circuit shown, you can have a fast response with a Darlington configuration. The circuit is...
We found this multiple thermostat circuit in July 1980 Radio Electronics magazine. It uses...
Mouser Electronics is already providing new MOSFETs EF SIHx28N60EF of Vishay series for voltages...