tv remote
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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.
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