Ir Receiver Circuit Diagram. The remaining pins are all linked. 4 channel latch or momentary on board jumper for selection.
Note the diagram above has a black ir led and a transparent photodiode this is not very common as it. The infrared signal generates an equivalent photo current in the photo pin diode. It generates the continuous pulses of the frequency.
And non inverting end pin 3 is connected to the junction of photodiode and a resistor.
Supply transmitter. In the circuit photodiode is connected forward bias. Dimensions and pin assignment. The infrared signal generates an equivalent photo current in the photo pin diode.