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.
With the presented circuit it is possible to detect signals from transmitters in a frequency range...
Found in a General Electric documentation from 1970, this circuit consists of a relaxation...
This circuit was obtained from an American 80's documentation. It can be implemented with modern...