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 circuit was obtained from a 1977 magazine, but can still be mounted using BC548 for TR1 and...
The oscillator of the figure has its frequency determined by the crystal. The indicated value is...
This heartbeat sensor circuit was found in the July 1992 issue of Radio Electronics magazine. The...