The TV remote control mainly relies on an integrated circuit (also known as a chip) to send commands. The chip is packaged in an 18-pin dual in-line package (dual in-line package, abbreviated as DIP). On the right side of the chip, you can see a diode, a transistor (black with three pins), a resonator (yellow), two resistors (green), and a capacitor (dark blue). There is also a resistor (green) and a capacitor (small brown disc) next to the battery contacts. In this circuit, the chip can detect when a button has been pressed. Then, it encodes the button information in the form of Morse code, and the code of each button is different. The chip sends these signals to the transistor for amplification to enhance the signal.
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About the indicator light and the launch tube
A. The indicator light is mounted on the battery. Press any button on the remote control and the red light will illuminate. Generally used in universal remote control and set-top box remote control. But it is not related to the quality of the remote control.
B. The launch tube, the infrared signal emitted, is the principle of the infrared remote control. The naked eye is invisible, the easiest way is to use the camera lens to view.