This circuit was found in General Electric documentation from the 1980s. The circuit is intended to receive 50 kHz modulated optical signals. The components support modern equivalents.
An interesting and useful configuration for the control of power loads is shown in the figure. In this...
This circuit was suggested by Linear Technology in a 1980s documentation but can be implemented with...
This circuit, from a 1999 publication, uses an improvised optical coupler with LED or...