Found elsewhere in this section, but from other sources, this circuit is from Motorola documentation. The circuit uses a triac of the time and a tripping transformer. The circuit is for 110 V network.
This 2003 circuit uses two types of sensors: by reed-switch and by infrared. If the magnetic...
This circuit was obtained in a 1995 documentation and has a simple configuration using only common...
Found in a 1968 Electronic Design, this circuit makes use of an unusual ultrasonic delay line...