Obtained in an Electronic Design from 1968, this circuit has the voltages determined by the zener diodes. Transistors can be modern equivalents.
For the NOR or no-OR function (negative of the OR function) we take the previous configuration (CB15067E)...
We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as...
We find this circuit in an American 80's documentation. It makes use of IC sensor which is mounted...