This circuit was found in a 1967 EEE. The transistors are from the time and can be tested equivalent.
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...