This circuit was obtained from a 1967 General Electric manual. The circuit uses components of the time, but equivalents can be used, for example, a BC547 for the transistor and a TIC106 for the SCR.
Found in a 90s Popular Electronics, this circuit uses a MAR-X to amplify signals up to 2 GHz. The...
This circuit is from an old French documentation from the 70s. The coupler admits equivalents and...
We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be...