الصورة الكبيرة
| Material: | Plastic |
|---|---|
| Bearing: Load | Other |
| Process: | Printing Gravure |
| Specification: | A Variety Of |
| Color: | Multicolor |
| Uses: | Other |
| Model: | Packaging See |
| Customization: Processing | No |
| Level: Package | Packaging Sales / Packaging Terminal |
The TV remote controller is a device used to control machine. Modern remote control, is mainly produced by different information integrated circuit board and used to button up the contains a called "central processor", the English called the CPU, it is TV computer, CPU in manufacturing will TV all menu password input information, TV remote control transmitter as long as a corresponding password can realize the TV remote control.
The TV remote control device is composed of a microprocessor chip, a crystal oscillator, an amplifying transistor, an infrared light emitting diode and a keyboard matrix, which are formed by the remote control signal. Its working principle is as follows: the internal oscillator of the microprocessor chip IC1 is composed of a high frequency oscillator through 2, pin 3 and an external oscillating crystal X, producing a high frequency oscillation signal (480kHz) This is fed into. Signal a timing signal generator to generate a sinusoidal signal and a timing pulse signal of 40KHz. The sinusoidal signal is fed into the encoding modulator as a carrier signal the timing pulse signal is transmitted to the signal generator, the keying; input encoder and the instruction encoder as the time standard signal of these circuits.
IC1 internal sweep signal generator generates different fifth time scanning pulse signal, from feet output sent to the keyboard matrix circuit. When 5 to 9 a button is pressed, the control signal corresponding to the function keys is input from feet to the 10 to 14 key control encoder, and the corresponding function of the digital signal is output. Followed by the encoder output instruction code signal, after modulation on the carrier signal, formation contains a functional information of high frequency pulse on, by output through a transistor 17 feet BG amplification, driven infrared light emitting diode D emits a pulse modulated signal.
Now use the remote control device using frequency is 38kHz, is in a certain way to different key code, the TV by a special integrated circuit produces a modulated wave, transmitted from the infrared diode. after receiving, the decoder performs the appropriate action. Different frequency infrared pulse signal corresponding to a different command, and the pulse is implemented with quartz, electricity vibration frequency of the quartz is very fast and very uniform, so you can use it to achieve different pulse frequency.