This circuit was found in a 1968 General Electric manual. The circuit is for 3 A motors but can be changed according to the SCR used. The SCR is type 106 and R1 is 10k.
This source, with slight variations, can be found in other articles in this section and on this...
This 45 to 90 Hz hum elimination circuit was obtained from a 1980s documentation. The operational can...
This simple 2004 circuit uses a common sensor used in television and other equipment. It checks...