We found this circuit in a Radio Electronics from December 1963. The circuit combines valves and transistors and has a high input resistance. The circuit is powered by two batteries.
The LM3911 from National Semiconductor (Now Texas) is a temperature sensor that provides an output...
Found in a 1990 Electronics Handbook, this circuit causes an LED to flash when the phototransistor receives...
This circuit was obtained in a Portuguese publication in 1979. It is a simple code switch that...