This traditional dimmer configuration for incandescent lamps and heating elements was found in an RCA transistor manual. SCR can be a more modern equivalent like TIC106, depending on the power grid.
With the circuit shown in the figure we have a frequency modulation which is produced by a...
This is a circuit found in a 1970's Radio Electronics. The circuit works with virtually any triac...
This circuit was found in a 1970s RCA publication. Transistors support modern equivalent types....