Eco TV. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Eco TV. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Телевидение

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Quite a lot has been written about the dangers of spending a long time in front of television screens and computer monitors. The need to follow basic rules for using these electronic devices, which help reduce the harmful effects on the human body, has also been spoken and written more than once. Is it possible to turn, say, televisions into devices that produce useful negative air ions like the famous “Chizhevsky Chandelier”? The author of the published material is a major specialist in the field of television, and this is exactly what we are talking about. He proposed changing the way the kinescope is powered, which then turns into a “generator” of negative air ions. Based on his proposal, a priority certificate for the invention has already been received.

The widespread use of color televisions and, especially, computers has given rise to a new area of technology that is aimed at combating all kinds of harmful radiation from picture tube screens. For example, expensive filters and other devices for computer monitors appeared. However, objective measurements show that any significant electromagnetic radiation from the screen of a color picture tube is not registered, since its mask functions as a shielding device.

The reasons for the harmful effects of monitors and televisions on their users are completely different. First of all, this is the most common eye fatigue. If, for example, you peer at the small details of an image on a computer screen for many hours in a row, and even at close range, your vision deteriorates, myopia progresses, and even intraocular hemorrhages are possible.

The very principle of constructing existing monitors and televisions, in which the negative terminal of a high-voltage voltage source is connected to the cathode assembly of the kinescope and to the common wire of the device, and the positive terminal is connected to the second anode and is isolated from the housing, is also extremely unsuccessful. The high potential at the anode of the kinescope creates an induced charge on the surface of its windshield. Dust flying in the surrounding air, and along with it bacteria and microscopic fungi, are attracted to the kinescope screen (which is why you have to wipe it so often). Some of the dust moving towards the screen is intercepted by the user and inhaled, which causes the development of asthma and other lung diseases. An external screen connected to a common wire only increases the potential gradient near the windshield, and dust inflow increases.

A high potential gradient also exists inside the body of a TV or monitor. Under its influence, air molecules are ionized. Negative ions are attracted to the anode of the kinescope and are neutralized, while positive ions come out of the housing and gradually fill the entire room. The harmful effects of positive air ions on the human body and the beneficial effects of negative ones were discovered by A. L. Chizhevsky. Consequently, TV and computer monitors are powerful sources of harmful air ions.

These disadvantages can be eliminated in a relatively simple way. The main novelty of the proposal is that the high-voltage voltage source is connected to the common wire not by the negative terminal, but by the positive terminal. Connecting the second anode of the kinescope to the common wire eliminates the appearance of an induced charge on the windshield, and therefore eliminates dust absorption. The high negative potential at the cathode site neutralizes the positive ions attracted to it. Negative ions, on the contrary, are repelled from it and come out of the housing openings into the room.

Consequently, a TV or computer monitor turns into a generator of negative air ions. The resulting flow ensures the saturation of the air in the room with negative ions and the absorption of positive ions, including those created by other household devices.

The practical implementation of such an environmentally friendly video viewing device is relatively simple. To do this, the line transformer is remade, and the video amplifiers, located on the kinescope board and under high negative voltage, are connected to the video path of a TV or computer monitor through an isolating device, for example, optoelectronic units with flexible light guides. The focusing voltage of the kinescope, as well as the voltage for powering the video amplifiers, is obtained in the usual way, i.e., by straightening horizontal scan pulses.

Author: B.Khokhlov, Moscow

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