We find this circuit in an Electronics Now. The indication of the logic level is done on a 7-segment display according to the connections given in the diagram.
Using a 4N33 optical coupler, we have in the figure an optical interface for TRTL circuits,...
Found in a Popular Electronics from the 90's, this circuit can generate frequencies according to the...
We found this circuit in a 2001 publication. It consists of a system that automatically discharges a...