Today we will understand how the TV works and how the video signal is transmitted. Now the most popular TVs are plasma and liquid crystal. But in order to most fully understand the principle of television, it is better to consider televisions made on the basis of a cathode ray tube.
Large pieces of metal may interfere with radio frequency. The receiver is connected to a junction box located at the bottom of the fireplace. All are compact in size to lift the palm of your hand and come with a wall bracket for easy storage.
This remote control offers the function of turning the flame on and off manually or by temperature control. Timer countdown. 24 hours clock. This remote is perfect for the homeowner who wants to double as a wall thermostat and the convenience of a remote. remote control. Use manual or thermostatic settings to control the fireplace at the desired temperature between 45 and 99 degrees.
The basic principle of operation of TVs
Formally, the image transfer process is quite simple:
- Light-sensitive elements of television cameras convert light radiation into a specific electrical signal.
- The resulting electrical signal is processed and broadcast.
- There are three electron guns on the back of the TV. As a result of receiving signals from the television, they create electron beams and direct them to the inside of the TV, which is coated with a special substance - a phosphor. When a given substance and electrons come into contact, a glow is formed.
- From the glow of red, green and blue light, the whole picture is created on the TV screen.
Scheme of 3D TV operation
As you can see, the principle of operation of old TVs is quite simple. But how does a 3D TV work?
This multifunctional remote control provides maximum functionality and convenience. The remote control is user convenience. They are great for today's busy lifestyles and enhance the relaxing mood created by our gas fireplace, allowing the user to relax in their favorite chair and operate their fireplace in comfort. They are especially useful in large rooms where the fireplace or wall switch is not always easily accessible.
The wall switch may be in childproof mode. Once this is set, only the arrows will have functionality. When the fireplace is turned on or off, the appliance may enter child protection mode. To exit Child Lock: Press the Up Arrow button twice and the Down Arrow button once.
In fact, 3D TVs only create the illusion of three dimensions. The whole principle of creating the 3D illusion is quite simple and is based on the fact that our eyes are at a distance from each other. Based on this fact, it can be assumed that if you show the same image to each eye, but from a different angle, the brain will combine these two images, and as a result, a three-dimensional image will come out. The film industry uses methods that rely on this factor.
To enter child lock mode: press the up arrow button twice and the down arrow button once. TV remote controls use infrared light to send signals to a receiver, which converts them into electronic instructions for your TV. The small bulb in your remote may not be strong enough to send clear signals over 30 feet. You can increase this range and focus the infrared beam by installing a metal reflector inside the remote control.
In the first case, two images are depleted, while each image is modified using a color filter. In order to view such a video, you will need glasses with two lenses of different colors. Thanks to these glasses, each eye sees the same image, but from a different angle. This method of creating 3D has been known for a long time and was first used to add volume to the image in black and white cinema. The color filter method is called anaglyph.
We save the inscriptions on the remote control from erasing
This inexpensive and easy method can add 5 to 10 feet to your range. Remove the remote control batteries and locate any screws holding the case in place. Typically, three to four screws are visible on the back of the case. Remove these screws and carefully separate the top and bottom of the case.
This step prevents the conductor from contacting the metal reflector and creates short circuit, which may cause your remote control to malfunction and become hot. Insert batteries and test your remote for more range than previously possible.
In modern films, anaglyph is used less and less. The color filter was replaced by the so-called polarization filter. The principle of polarization is similar to that used in anaglyph, but instead of color conversion, the light waves that the viewer's eye notices are changed. When watching such films, you also need glasses that have lenses of different polarizations. This method of creating 3D gives a better and more realistic result.
Make sure there are no objects obstructing the line of sight between your remote control and the TV because infrared light cannot pass through solid objects. Remote control is a convenience feature for the consumer and allows you to work with devices that do not have convenient access for direct operation of the controls. Therefore, the result will be an unreceived signal from the receiver, and therefore no action will be taken. The remote control for these devices is usually a small wireless pocket object with a set of buttons to adjust various settings such as the TV channel, track number and volume. The simulation results show that the jamming effect is largely affected by the frequency, phase, and intensity of the interfering signal. Specifically, the interference frequency has the greatest influence on the interference effect. The noise frequency must be greater than a certain value to affect the search process. In addition, the interference intensity must be greater than a certain value related to the pulse position technique in order to be able to effectively influence the searcher signals. As a result, interference must be with appropriate parameters to influence the control signals so that the target is pushed out of the field of view and missed, or leads to an unstable search situation because the miss distance is so large. From time to time, two people may have different opinions. about which TV channel or entertainment unit should be received. These peoples are commonly referred to as "channel checkers". 5 Infrared remote controls use pulses of infrared light to transmit information between electronic devices. Most of these remote controls send out an infrared pulse pattern that represents the transmitted information twice. The receivers compare the two pulse patterns to ensure that the information is received correctly. If a difference is detected, a transmission error is received and the transmitted information is ignored. The first timer is designed to create a pulse wave at the same frequency used in the modulation of the infrared transmission method. The second timer reduces power consumption, which is especially important for a battery-powered handheld device. Since the information transmitted by the remote control is a long train of pulses, only periodic noise is needed to eliminate enough errors to disable the device. 6 The transformer steps up or steps down the input line voltage and isolates the power supply from the power line. However, as you begin in this chapter, you will learn that the pulsating D.C. unwanted. Block diagram of the main power supply. the first section is the transformer step up or steps down the input line voltage and isolates the power supply from the power line. Block diagram of the main power supply. It keeps the power supply output at a constant level despite large changes in load current or input voltage 7. Now that you know what each section does, let's follow the signal alternating current through the power supply. At this point, you need to see how this signal changes in each section of the power supply. Later in the chapter you will see how these changes take place. The transformer is a step-up transformer with a turn ratio of 1: since each diode in the rectifier section conducts for 180 degrees of 360 degree input, the rectifier output will be half or approximately 173 volts of ripple DC. The filter section, network of resistors, capacitors, or inductors controls the rise and fall times of the changing signal, hence the signal remains at a more constant DC level. You will see the filtering process more clearly when discussing actual filter circuits. The output of the filter is the signal constant voltage 110 volts, while the variable speed of rotation falls to direct current. The reason for the lower voltage will be explained later in this chapter. The 555 timer astable multivibrator is very simple, simple in design, very stable and cheap. It can be used to synchronize from microseconds to hours. As in the case of a monostable multivibrator, this is the charge and discharge time, and therefore the frequency is independent of the supply voltage. This bit is toggled each time the button is pressed or released. Using this bit, we can determine the weather, whether the button is pressed or not. The next 5 bits represent the device address. The last six bits in the frame format are commands. These command bits change for each button on the remote control. For our project, we need a 9V power supply with rated current 1 mA. I also had to remove 2 posts to make room for the 9 volt battery. Check it. You may need to work with a 10kg can to get the correct frequency for the device you are targeting. Adjust the pot when the remote is "on" and test it with the original remote until the interference confuses the device. Now just pull out the remote when you need to take control of your device and no one will know what's going on. You can bring this to your friends house and drive them nuts! Power switch wiring to remote switch How does it work? This is a pretty simple concept. To confuse the receiver, this jammer sends a constant stream of binary code at the same frequency, but contains no information to decode. The receiver basically sits there and doesn't respond at all, and real information can't get through to it until jamming is turned on. Slings are flying off the shelf because he makes remote viewing accessible to the masses. Electrical TapeAluminum Foil Crusher. . Design and construction of a power supply unit with remote control.
Not so long ago, another method appeared that has already begun to be used in 3D TVs. The bottom line is simple - all lenses and filters are installed in front of the screen, and the TV software identifies the user's position and provides a smooth 3D picture.
The principle of operation of the remote control
Now we only need to find out how the TV remote works.
Department of Electrical and Computer Engineering, Federal University of Technology, Nigeria. The document presents the design and construction of an infrared remote control power control box, which is a device that allows the user to operate or control power from a network located from 5 to 10 meters. The remote control transmits a beam of light using an infrared light emitting diode; this light is selected and decoded by the receiver unit.
The receiver is only activated when it receives a beam of light, there are no random triggers. The details of the steps are described in the article. Transmitter, infrared port, control, device, design. With the development of technology, new electrical protective devices have been developed with varying degrees complexity, and various failures of these systems have been reported. The design and construction of a reliable economical protective device, the "remotely controlled power supply unit", must be used in cooperation with some other types of protective devices.
In fact, the process is quite simple:
- When you press any button on the remote control, two tracks are closed.
- As a result of this short circuit, an impulse is transmitted to the central chip of the remote control.
- Next, the central chip sends an electrical signal to the photodiode. Information is transmitted using an infrared signal. This signal is invisible to the human eye, but it can be detected using various equipment (for example, you can use a camera).
- This signal is caught and processed by the receiver of the TV itself. The signal is checked for information about the remote control model, as well as for the desired command.
Gone are the days when, in order to change TV channels on the TV, add sound to the tape recorder, or rewind a cassette, one had to get up from the sofa and approach the actual knobs and switches on an electronic device. Of course, there was nothing wrong with that - once again raising your “fifth point” is very good for health, but still, technological progress is inexorable and thanks to it a remote control appeared, without which the control of not one of the modern electronic devices is actually indispensable. devices.
Let's see how this miracle of technology works. In fact, everything is quite simple, if you do not go into details. A remote control, for example, a tricolor TV remote control, does not perform any functionally complete task by itself. It works only in tandem with the device (TV, tape recorder, air conditioner) with which it is originally bundled or for which it is intended.
There is a microcircuit in the remote control itself, which converts information about the pressed key into a sequence of electrical impulses that are fed to the emitter (usually an infrared LED). In turn, the emitter transmits an already visually converted signal to a photodetector, which is located in the electronic device itself (TV, tape recorder or air conditioner). Having received information in a visual form, the photodetector converts it into a sequence of electrical impulses that are fed to the microcircuit of the device control unit. And it, in turn, already generates signals to control the functions of a TV, tape recorder or air conditioner.
That is, after you press one of the buttons on the remote control, the signal is first converted into a light form and then back into an electrical signal. The convenience of such a system is that a very large amount of information can be recorded using a sequence of pulses (electrical signal). This allows not only to give the remote control more functional fullness, but also to use its own unique code for almost every electronic device, so as not to cause false alarms of other electronic devices that are not currently required to be controlled.
Mainly for household management electrical appliances infrared remote control is used 
management. This means that the transmission of the information signal from the emitter to the receiver is carried out in the infrared light range. The human eye cannot see in this range, so we do not physically notice the flickering of the emitter. On the one hand, this is very good - control signals do not interfere, for example, with watching a TV show. However, on the other hand, we cannot visually see whether the remote control is working or broken. But this is not such a big problem. To check the operation of the remote control, it is enough to have at hand mobile phone with a camera. Turn it into camera mode and point the camera at the remote's LED. When you press any of the keys, the working remote control will emit periodic flashes that are clearly visible on the mobile screen. That's all.