We know that our television set, DVP, MP3 players, music systems etc are controlled by using remote .IR Remote control work on 38KHZ frequency signal. Here we are going to make an IR Remote tester circuit using TSOP1738 IR receiver sensor circuit using which we can test our remotes.
Case 1: After powering up the circuit when we press any key on the remote then remote sends signals of around 38 KHz frequency. These signals are received by TSOP1738 sensor and it gives output as LOW. We use this LOW output to activate the LED then LED starts glowing.
Case 2: If this TSOP1738 sensor doesn’t respond with the key presses on the remote control, it indicates that the remote control is not working properly.