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.

Common Gate FET Stage (CB4685E)
This field effect transistor amplifier circuit in common gate or common port configuration is from an old...
PH meter (CB20731E)
This circuit was obtained in an old American documentation. The integrated circuit used is...
LM393 Zero Crossing Detector (CB4484E)
This zero crossing detector is of the 1993 Motorola Linear Interface ICs. The source is...