tv remote control
When you press a key of your TV remote control, first it translate that key-press into infra-red light signals that are received by the TV. The components that makes TV remote are:- 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. And 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.
Re: TV remote control
A remote control is an electronic device used for the remote operation of a machine. The term, sometimes abbreviated to “remote” and also called a “controller”, “flipper”, “clicker”, or “changer” is most commonly used to refer to a remote control for televisions or other consumer electronics such as stereo systems and DVD players, and to turn on and off a mains plug/socket. Remote controls for these devices are usually small wireless hand held objects with an array of buttons for adjusting various settings such as television channel, track number, and volume. In fact, for the majority of modern devices with this kind of control, the remote contains all the function controls while the controlled device itself only has a handful of essential primary controls. Most of these remotes communicate to their respective devices via infrared (IR) signals and a few via radio signals. They are usually powered by small AAA or AA size batteries. Technique The emission spectrum of a typical sound system remote control is in the near infrared. The emission spectrum of a typical sound system remote control is in the near infrared. The modulation of the IR diode varies by button. The modulation of the IR diode varies by button. Most control remotes for electronic appliances use a near infrared diode to emit a beam of light that reaches the device. This light is invisible to the human eye but carries signals that are detected by the appliance, as well as by the sensor of a digital camera. With a single channel (single-function, one-button) remote control the presence of a carrier signal can be used to trigger a function. For multi-channel (normal multi-function) remote controls more sophisticated procedures are necessary: one consists of modulating the carrier with signals of different frequency. After the demodulation of the received signal, the appropriate frequency filters are applied to separate the respective signals. Nowadays digital procedures are more commonly used. One can often hear the signals being modulated on the infrared carrier by operating a remote control in very close proximity to an AM radio not tuned to a station.
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