A simple extension cord for the remote control. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Television, video equipment

 Comments on the article

The need for a device that increases the range of the remote control (RC) arose after the installation of an antenna and a receiver (receiver) of satellite television signals. The receiver is located in the room, and the TV is in the kitchen. They are connected by a cable laid along the plinth. The receiver is equipped with a remote control. But in order to switch the satellite TV channel, you need to go to the room to the receiver.

The task was to develop a device that increases the range of the remote control in order to provide the ability to switch satellite TV channels without leaving the TV installed in the kitchen. This device should be so simple that it can be assembled and adjusted in one day (weekend design). It should be housed in the case of an old remote control and be powered by a battery of two AA batteries or galvanic cells, and with a current consumption so small that it does not require replacement or recharging of batteries for several months.

Fig. 1

All these requirements are met by the proposed device, the scheme of which is shown in Fig. 1. The device contains a power battery GB1, a current-limiting resistor R1, an infrared-sensitive photodiode VD1, a load resistor R2, a two-stage current amplifier based on transistors VT1, VT2 and a resistor R3, and an infrared emitting diode VD2.

The device works like this. The radiation of the remote control is directed to the photodiode VD1. Current pulses in the circuit of the photodiode VD1 amplify the transistors VT1 and VT2. Further, the amplified current pulses in the collector circuit of the transistor VT2 are fed through the connecting line to the infrared emitting diode VD2, located next to the receiver so that the radiation of the VD2 diode falls on the receiver's photodetector. The receiver responds to the pulses of the emitting diode VD2 in the same way as to the remote control commands.

Fig. 2

The device is assembled by surface mounting and placed in the case of a failed remote control of an old TV. The VD1 photodiode is mounted where the remote control emitting diode was previously installed. Appearance is shown in the photo fig. 2. The device is located next to the TV installed in the kitchen. To the left of it is the remote control of the receiver. The emitting diode VD2 next to the receiver, as shown in the photo fig. 3.

Fig. 3

The emitting diode VD2 is connected to the collector circuit of the transistor VT2 with a line of two MGSHV wires of different colors so as not to reverse the polarity. The line is laid along the plinth next to the cable connecting the receiver to the TV. Line length - 16 m.

The photodiode VD1 and the emitting diode VD2 of the infrared range are used from a ball computer "mouse". You can also use a VD2 emitting diode from any remote control. Current consumption in standby mode - a few tens of microamperes. Therefore, the power switch is not installed. In eight months of operation, the batteries had to be charged only once.

When setting up, it is necessary to measure the current consumption in standby mode. It should not exceed 50 μA, otherwise reduce the resistance of the resistor R2. Instead of the infrared emitting diode VD2, a high-brightness LED is temporarily installed, for example, AL307KM or L-1513SRC-E, and check that it glows when the remote control buttons are pressed.

Author: S. Bodagov

See other articles Section Television, video equipment.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Major risk factor for gambling addiction 07.05.2024

Computer games are becoming an increasingly popular form of entertainment among teenagers, but the associated risk of gaming addiction remains a significant problem. American scientists conducted a study to determine the main factors contributing to this addiction and offer recommendations for its prevention. Over the course of six years, 385 teenagers were followed to find out what factors may predispose them to gambling addiction. The results showed that 90% of study participants were not at risk of addiction, while 10% became gambling addicts. It turned out that the key factor in the onset of gambling addiction is a low level of prosocial behavior. Teenagers with a low level of prosocial behavior do not show interest in the help and support of others, which can lead to a loss of contact with the real world and a deepening dependence on virtual reality offered by computer games. Based on these results, scientists ... >>

Traffic noise delays the growth of chicks 06.05.2024

The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>

Random news from the Archive Rome is older 03.07.2006 Archaeologists have long doubted the accuracy of the legendary founding date of Rome. The traditional version says that the city was founded on an empty spot by Romulus in 753 BC. e. Recently, under the ruins of the ancient Roman forum, a burial was discovered about three thousand years old, that is, about 250 years older than the traditional date. A funerary urn and several vases were found in the grave. Apparently, the forum was founded on the site of a much more ancient necropolis.

Other interesting news:

▪ Voice controls home appliances

▪ Radar on the bumper

▪ Playing with dolls develops empathy

▪ Wireless data transmission 1 terabit per second

▪ Cell remote control

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Lighting. Article selection

▪ article Movement is everything, purpose is nothing. Popular expression

▪ article Which record was sold the fastest? Detailed answer

▪ article Tractor driver (tractor driver). Standard instruction on labor protection

▪ article Multichannel remote voltmeter. Encyclopedia of radio electronics and electrical engineering

▪ article Trunk amplifier for STB-receiver. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024