This zero-crossing circuit was found in the 1989 Radio Electronics Experimenter. The Triac must be controlled according to the load.
This circuit was obtained from Radio Electronics from the 90s. The infrared sensor is of an...
This circuit is suggested by Motorola and is based on a 1723 voltage regulator. The 2N3055...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...