Inside a TV Remote Control

If you are like most Americans, you probably pick up a TV remote control at least once or twice a day. Let's look inside and see how they work. Here is the remote we will be dissecting today:

The remote control's job is to wait for you to press a key, and then to translate that key-press into infrared (pronounced "infra-red") light signals that are received by the TV. When you take off the back cover of the control you can see that there is really just 1 part visible: a printed circuit board that contains the electronics and the battery contacts.

The components that you see here are typical for most remotes. You can see an integrated circuit (also known as a chip) labeled "TA11835". The chip is packaged in what is known as an 18 pin Dual Inline Package, or a DIP. To the right of the chip you can see a diode, a transistor (black, with three leads), a resonator (yellow), two resistors (green) and a capacitor (dark blue). Next to the battery contacts there is a resistor (green) and a capacitor (tan disk). In this circuit, the chip can detect when a key is pressed. It then translates the key into a sequence something like morse code, with a different sequence for each different key. The chip sends that signal out to the transistor to amplify the signal and make it stronger.

The Circuit Board

When you unscrew the circuit board and take it out, you can see that the circuit board is a thin piece of fiber glass that has thin copper "wires" etched onto its surface. Electronic parts are assembled on printed circuit boards because they are easy to mass produce and assemble. In the same way that it is relatively inexpensive to print ink onto a sheet of paper, it is inexensive to "print" copper wires onto a sheet of fiber glass. It is also easy to have a machine drop the parts (the chips, transistors, etc.) onto the sheet of fiberglass and then solder them on to connect them to the copper wires.

When you look at the board, you can see a set of contact points for the buttons. The buttons themselves are made of a thin rubbery sheet. For each button there is a black conductive disk. When the disk touches the contacts on the printed circuit board, it connects them and the chip can sense that connection.

At the end of the circuit board there is an infrared LED, or Light Emitting Diode. You can think of an LED as a small light bulb. Many LEDs produce visible light, but a remote's LED produces infrared light that is invisible to the human eye. It is not invisible to all eyes, however. For example, if you have a camcorder it can see the infrared light. Point your remote at the camera and push a button. You will be able to see the infrared light flashing in the viewfinder. The receptor in the TV is able to see infrared light as well.

So the basic operation of the remote goes like this: You press a button. When you do that you complete a specific connection. The chip senses that connection and knows what button you pressed. It produces a morse-code-line signal specific to that button. The transistors amplify the signal and send them to the LED, which translates the signal into infrared light. The sensor in the TV can see the infrared light and "seeing" the signal reacts appropriately.

Links General:

How Television Works

Technical:

Remote Control FAQs

How do remote controls work?

Remote controls work with the help of a transmitter that is fitted into the handset. This transmitter sends out a stream pulses of infrared light whenever someone presses a button. The infrared light forms a pattern that is unique to that button, which lets the receiving antenna know how what command to carry out.

Can you control a TV remotely?

Smart TVs can be controlled with a dedicated app. This app allows the user to have complete control over their Smart TV regardless of where they are.

Can you program any remote to any TV?

While every TV set model comes with a specific remote control that has been programmed to that TV set, there are universal remote controls that allow you to use them with different TVs, depending on the codes that are listed on the remote.

How does a TV remote send signals?

A remote control works by sending out infrared waves that are picked up by the TV set. These infrared waves form a unique pattern, which is picked up by the TV and helps it recognize what action to take.

Do remotes work through walls?

Modern IR remotes are designed to send infrared light waves to the IR photodiodes of the device. These signals can be sent through solid objects, such as furniture and walls.