This circuit makes use of unusual components today. We found it in General Electric documentation from the 1980s. The circuit operates with modulated optical signals.
Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using...
This crystal shortwave radio can tune signals up to the VHF range of analog TV (which no longer...
We found this circuit in the Electronics Experimenter Handbook magazine from 1993. L1 has 2 = 2...