Infrared Remote Control Tester

Description: This compact Infrared Remote Control Tester circuit is designed to verify the functionality of an infrared remote control unit. The circuit operates by connecting a piezo buzzer directly to an IR receiver integrated circuit (IC). The TSOP1738 integrated IR receiver captures, amplifies, and demodulates the infrared signal emitted by the remote control, resulting in an output frequency of approximately 700 Hz. This output is connected to the piezo buzzer, making the signal audible. The remaining components are responsible for generating a stable 5 V power supply from a 9 V PP3 (6F22) type battery. Alternative devices to the TSOP1738 from other manufacturers can be utilized, and the circuit can accommodate carrier frequencies other than 38 kHz. Although there may be a mismatch between the nominal carrier frequencies of the transmitter and receiver ICs, the circuit remains functional, albeit with reduced range. It effectively determines whether a remote control is emitting an infrared signal.

The Infrared Remote Control Tester circuit consists of several key components that work together to provide an effective testing solution for infrared remote controls. At the heart of the circuit is the TSOP1738 IR receiver, which is designed to detect infrared signals modulated at a specific carrier frequency, typically around 38 kHz. When an infrared signal from the remote control is received, the TSOP1738 demodulates the signal and outputs a square wave at approximately 700 Hz, which corresponds to the modulation frequency of the incoming signal.

The piezo buzzer serves as an output device that converts the electrical signal from the TSOP1738 into audible sound. When the IR signal is detected, the buzzer emits a tone, indicating that the remote control is operational. The circuit is powered by a 9 V battery, which is regulated down to 5 V using a voltage regulator circuit. This ensures that the TSOP1738 and the piezo buzzer receive the appropriate voltage for optimal operation.

In terms of component selection, while the TSOP1738 is a popular choice, other IR receiver ICs can be substituted as long as they are compatible with the modulation frequency of the remote control being tested. This flexibility allows for a broader range of applications, accommodating various remote controls that may operate at different frequencies.

The circuit design is relatively straightforward, making it accessible for hobbyists and professionals alike. It is essential to ensure proper connections and component placement on the PCB or breadboard to avoid any operational issues. Overall, this Infrared Remote Control Tester is a valuable tool for confirming the functionality of remote control units, providing a simple yet effective means of troubleshooting infrared communication devices.This small InfraRed Remote Control Tester circuit is used for checking the operation of an infrared remote control unit. The circuit is based on the idea of connecting a piezo buzzer directly to an IR receiver IC. The TSOP1738 integrated IR receiver accepts, amplifies and demodulates the IR signal from the remote control, producing an output with

a frequency of around 700 Hz. The piezo buzzer is connected to its output, rendering the signal audible. All the other components are simply concerned with producing a stable 5 V power supply from the 9 V PP3-(6F22) type battery. Instead of the TSOP1738 similar devices from other manufacturers can be used, and of course carrier frequencies other than 38 kHz can be used.

The circuit still works if there is a mismatch between the nominal carrier frequencies of the transmitter and receiver IC, but range is reduced. It is still, however, adequate for determining whether a remote control is producing an IR signal or not.