Using an operational amplifier, this circuit from a 90s Popular Electronics, is characterized by its high sensitivity. R5 can be added to control the gain.
The receiver for this circuit is CB18789E. The system operates with modulated infrared and has 4...
Found in the June 1962 Radio Electronics magazine, this circuit uses 4 transistors. The range...
The PNP transistor can be a BC548 and the NPN any common phototransistor. The circuit is from 1968...