Latching relay (CB25722E)

The figure shows how to connect a relay to obtain the latch effect. The circuit is from an Electronics Now from June 1994.

Voltage Detector (CB26083E)
This circuit consists of an electrostatic sensor that can check if a cable is energized by simply...
JFET Timer (CB12123E)
This circuit was found in a 1979 magazine. We can use any JFET like MPF102 or BF245. The relay is 12 V...
High Voltage SCR Alternating Source (CB13208E)
This circuit supplies a load with pulsating direct current that can be filtered by C1 (10 uF to...