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.
This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The...
This frequency band below 15 kHz converter was found in a Popular Electronics from the 90's. The...
This timer circuit was found in a 1980s American documentation. Transistors and SCR support modern...