Testing TSOP1738 Infrared Receiver With a Simple Circuit

 TSOP1738 Infrared Receiver is in an integrated chip with three terminals outside, one for ground, another for power supply and the third for signal output. It works on 38 kHz. There are other ICs in the series which work on other frequencies like TSOP1730 which works on 30 kHz and TSOP1736 which works on 36 kHz. The 38 kHz working frequency of TSOP1738 is not the frequency of the infrared light which it senses, which is very much higher than 38 kHz. It is the carrier frequency which is modulated by the infrared signals in the infrared remote. The output from TSOP1738 can be fed to a decoder to achieve the actual function of the remote control. In the various devices which use at home like television and air-conditioner use remote controls to operate them. In this simple experiment, output of TSOP1738 sensor is being fed to a green LED through a 1K resistor. The LED will blink if you point any remote control working on 38 kHz is pointed at the IR sensor and pressed.


TS1730 has a PIN diode inside as the photodiode. PIN diode has an 'intrinsic' undoped semiconductor region between the P and N type doped semiconductors. PIN diode is an inferior rectifier, but makes it suitable for applications like photodetectors and fast switches.

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