Almost all of us from the young child to an old person use the TV remote control a number of times during a day, but only a few of us will think of how this small device in your hands works just when you press a button. Those of who desire to know how this device works, here is the answer for them.
Have you ever removed the back cover of your remote control? Those who have done it, they must have found a printed circuit board, the electronic parts of which are connected to the battery contacts which you in your remote. The circuit which you see printed under the back cover of your TV remote is known as integrated circuit. It is also called a chip in a commonly spoken language. You also must have heard of certain terms like radio waves, microwaves, X-rays and infrared which are part of an electromagnetic spectrum. Here we are concerned with infrared rays which light signals which move in the form of waves to your TV from your TV remote control when you press a button on the remote. Have you noticed, that these waves cannot reach the TV if you stand in between your TV sensor and your remote device? The pressing of the button on the remote translates your action into infrared light signals which are received by your TV and will not work if you obstruct these signals to reach the point of their destination on your TV. This happens because the infrared rays travel in straight line and cannot pass through an obstruction. The integrated circuit or chip of your remote is packaged in an 18 pin dual inline package also called DIP. To the right of this chip, you will find a diode, a transistor in black colour with three leads, a yellow coloured resonator, two green coloured resistors, and a capacitor of dark blue colour. Again, you will find a green coloured resistor and capacitor next to the battery contacts of your TV remote. The integrated circuit starts its function when a button on the TV remote is pressed. Your pressing of the button on the remote is detected by the chip and it translates it into a sequence like morse code. The circuit is so constructed so as to create a different sequence for different buttons on your TV remote. The chip then sends the signal out to the transistor to amplify the signal that finally is transmitted to your TV making it to work.
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