This circuit turns off when switch S1 is opened. The circuit is from the 1989 Radio Electronics Experimenter edition; The triac must be controlled according to the load.
This circuit was obtained in a manual of the used old operational amplifier. However, the same...
This circuit can gerenate square signals and be comanded by na external control. When the input...
The sensor for this circuit is a phototransistor. We found it in the April 1971 issue of Radio...