Remote control tester

Photocoupler

Below is the remote test circuit. This circuit is indeed an easy-to-use tester for verifying the basic operation of an infrared remote control. This is low cost and very easy to build.

The tester is designed around the infrared receiver module TSOP1738. The operation of the remote control is recognized by the tone from the buzzer. The circuit is sensitive and has a range of approximately 5 meters. The integrated IR receiver detects, amplifies and demodulates the IR signal from the remote control unit. The connected piezobuzzer, the sound at its output tells us the existence of the transmission, remote control unit.

Shown above in the schematic, the output pin 3 of the IR receiver module TSOP1738 (IRX1) is usually kept high, and the piezobuzzer is in silent mode. When the IR module IRX1 receives an infrared signal, its output goes low because of this, the piezobuzzer sound, to represent the transmission received from a remote (such as the remote control unit of the TV).

The circuit's power supply is used from the power supply of the capacitor potentiometer, a half-wave rectifier, a shunt regulator and related parts. Make sure capacitor C1 is type X2. A suitable small chassis work unit is convenient.

The circuit is assembled in a universal PCB and enclosed in a box. Make sure the front panel of the box/cabinet so that it can be easily located around the IR receiver module for the IR signal. Then, in soldering/connecting the shunt regulator and IR module, please check the TL431 and TSOP1738 pin configurations.