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.
Suggested by Texas Instruments in 1968 documentation, this circuit uses components from the era....
I found this circuit in an article in a 2003 publication. The circuit is an example of how to...
This configuration makes use of an LM3900 transconductance operational amplifier. The transistor can...