This circuit uses an optical coupler called Raystor created by Raytheon in the 1960s. The circuit uses components from the era that can be changed. The current is low.
May 2017 - Mouser Electronics supplies a wide range of sources for LEDs from Mean Well with inputs for...
This humidity sensor indicates the different levels of conduction of the sensors through an LED...
This circuit uses two 4001 ports to drive a relay. The circuit is from Electronics Now magazine, July...