This circuit is from a 1992 publication and is based on CMOS technology. The circuit is powered by a 6 V source and the displays are of common cathode.
The circuit shown was found in the February 1994 issue of Electronics Now magazine. The circuit...
This circuit can be implemented with standard photodiodes consisting of a two input optical AND gate....
Common general purpose silicon diodes when direct biased provide a voltage fall of about 0.6 to...