DIY sound amplifier from an old TV

Antenna amplifier: master class on how to make and use a simple device with your own hands

Today, over-the-air television broadcasting is still the most common form of receiving information. But a high-quality signal is provided only by the coverage area of ​​the tower, and if you are outside it, then you need to take care of the quality yourself.

The solution to the problem in such a situation will be an antenna amplifier. However, it is not necessary to buy it, since it is quite possible to make it yourself from scrap materials.

Why do you need an antenna amplifier? Features of the concept

An antenna amplifier for a car radio and TV is connected to the antenna if they want to improve the quality of audio or TV signal reception.

It is used in the following situations:

• long distance from the repeater to the receiver;
• wrong choice of antenna.

Thanks to this device, you can significantly improve the level of the displayed image. The optimal place to install a do-it-yourself antenna amplifier is considered to be a place close to the receiver. This is explained by the fact that the signal tends to decrease as it travels along the cable.

But in some situations, for example, in the case of remote reception, it makes no sense to install a signal-amplifying device close to the receiver.

Device types

As you can see in the photo of antenna amplifiers, they are:

Broadband. This type of device is used if it is necessary to improve image reception on several receivers simultaneously. They are usually installed in multi-storey buildings. A broadband device can operate not only in the DMB, but also in the MV range.

Range. With their help, it is possible to receive television signals from remote television towers. A range amplifier enhances the signal level and eliminates interference.

Multi-band. Such devices will be used to provide improved images from receivers located on high masts. The use of multi-band type devices is possible in the case of small collective reception systems.

Making a signal amplifier with your own hands

Consider the circuit of a simple antenna amplifier. Its entanglement begins from a power source with a voltage of 2.8-5.2 V. A device using this circuit is characterized by almost silent operation (the noise produced is only 2 dB) and has a fairly high gain (approximately 13 dB).

Another plus is that the assembled circuit does not need to be configured. The above device is suitable for indoor TV and radio antennas.

Work order:

• Prepare all the required electronic stuffing.
• Organize your tools and supplies.
• Make a printed circuit board. Moreover, it is better not to use a hinged assembly and special mounting panels, otherwise the device will produce too much noise during operation.
• Solder all electronic components.
• Check the resulting device carefully.
• Connect it to the antenna and receiver.

As for the power source, a more detailed description of how to make a power supply for an antenna amplifier can be easily found on the Internet.

Features of connecting a signal amplifier to a TV

The most important thing here is that the device is located as close as possible to the TV, because cable losses have a significant impact on the image level. This requirement applies not only to personally assembled devices, but also to purchased ones. An exception can be made only for antennas with a short cable.

Do not forget to carefully read the instructions for checking and connecting the amplifier. This will help avoid many problems.

If you have connected a signal-amplifying device, but no positive changes have occurred in the picture level, then you should check the direction of the antenna and the wave correspondence of these devices to each other.

Remember that all actions must be performed with the equipment turned off from the network.

Do not connect the amplifier to an external antenna that is not equipped with lightning protection.

In conclusion, we note that when creating an antenna amplifier, one must strive not only to amplify the signal, but also to ensure that the device produces as little noise as possible. To achieve this, use high quality parts and stay at the minimum dimensions for the device.

Photos of antenna amplifiers

Antenna amplifier: features, pros and cons

Our country is completely switching to digital television, abandoning the outdated analog signal. This means that now almost every home has a special antenna connected to it, which transmits the relevant information to the TV receiver. But what to do if your home is located at a considerable distance from a television tower and you often have to deal with interference?

Professionals will advise you to purchase an antenna amplifier. To do this, you will have to go to a specialized store and pay a considerable amount. But there is another solution: make the amplifier yourself. To accomplish this, you do not need special skills or a large amount of additional materials. You will learn about what needs to be done in this article.

Features of the antenna amplifier

The purpose of the amplifier is to make the antenna “active”. Let's take a closer look at this concept.

There are two types of television antennas:

They differ from each other in that passive devices receive a signal solely due to their shape, while active versions also contain other active elements. By adding an amplifier to the antenna, you will make it active, which will significantly improve the signal and achieve high-quality image and sound on the TV receiver.

How to connect an amplifier

To make an amplifier from an old audio system, follow the instructions below. There is nothing complicated in connecting the system, you just need some additional equipment:

1. First, inspect your device. On its rear panel there are connectors for connecting a special cable. The cord for connecting a music center with any equipment is called a “tulip”. It got its name because it branches into three colors: white, red and yellow.

2. When choosing a tulip, explain to the seller for what purposes it will be used. This way you won't go wrong with your purchase. Most likely, he will ask you to name the manufacturer and model of the system and device for which the amplifier is needed.

3. Once you have located the different colored inputs, insert the plugs from the cord into their sockets. You can determine which and where to insert by color; you just need to correlate them.

4. Connect the other end of the cord to a device that requires sound amplification.

5. The procedure is almost complete, you just need to configure the device. The correct setting does not depend on a specific brand or model. You just need to switch the music. Done, now you can enjoy high-quality sound.

You can carry out such an operation only if the equipment used is fully operational.

If it does not work, then you can try to disassemble the device and remove the amplification board from it. True, to connect it to technology you need to have specific knowledge.

Article on the topic: 4k TV as a monitor

DIY antenna amplifier - simple signal amplifier circuits

Although television is constantly evolving, expanding the network and increasing the capabilities of television equipment are not a guarantee of high picture quality. The specificity of the TV signal limits the distance over which it can be transmitted. In mountainous areas and in areas far from the tower, carrier waves arrive greatly weakened, which makes it impossible to receive individual channels.

In addition, incorrect design and shape of the antenna, errors in its installation, distance from the receiving and transmitting radio equipment - all this also negatively affects the picture level.

The solution to this problem is to create an antenna amplifier for digital television with your own hands.

Features and circuit of the antenna amplifier

An amplifier is a device designed to amplify a poor, unstable TV antenna signal. The advantages of this device are as follows:

• amplification of a television signal in a fairly wide frequency band;
• the ability to receive even a very weak TV signal;
• quiet operation.

The disadvantages include:

• the risk that the device will self-excite;
• High power signals in the meter wave range may overload the device;
• susceptibility to the effects of lightning currents;
• passive output losses.

The DIY antenna amplifier diagrams indicate how the device should be connected to the TV. The TV cable goes to a device that amplifies the signal, and then the signal goes to the TV. This scheme is universal.

Antenna amplifier for UHF

Modern digital television is broadcasting on decimeter waves (UHF). Frequency range – from 470 to 1270 MHz. The simplest solution for long- and ultra-long-range TV signal reception in the UHF range is to use a structurally simple antenna with an amplifier located close to it, which one can easily make with one’s own hands.

A DIY UHF antenna amplifier must have a significant gain, create a minimum of noise during operation and be resistant to temperature changes

A simple design, availability of the raw materials necessary for its creation and the absence of a tendency to self-excitation are other important requirements for such a device.

Antenna amplifier for FM receiver

To make an fm antenna amplifier at home, you will need:

• large round aluminum plate;
• a piece of copper wire;
• tractor rubber belt;
• TV cable;
• metal bracket (preferably aluminum);
• adapter;
• self-tapping screws – 4 pcs., nuts – 2 pcs., bolts – 2 pcs., washers – 2 pcs.

DIY computer speaker amplifier for dummies

When watching movies or listening to music, the power of standard speakers is often not enough for us. Below we will describe in detail how you can create a speaker amplifier manually. When creating an amplifier, you should take into account the power of external speakers, which is no more than two watts, and the resistance of the windings, which is equal to four ohms.

To assemble the device you will need the following components:

• printed circuit board;
• 9 - volt power supply;
• TDA series microcircuit;
• frame;
• the following capacitors: two non-polar 0.2 µF, polar 100 µF, polar 220 µF, polar 470 µF;
• constant resistor. 10 Kom m 4.7 Ohm;
• button - switch;
• input connector.

Instructions for creation

The process of assembling an amplifier for a computer directly depends on the circuit you have chosen. It is only important to leave space on the body for the radiator grilles. They are important because they allow air from the external environment to cool the chips.

• The first step will be to install the radio components on the printed circuit board, observing the polarity.
• We assemble the body. When assembling the case, you should provide space for radiator grilles and other additional parts. You can create the case yourself or purchase a ready-made one. You can also mount a board into the case.
• To identify malfunctions, you should turn on the device in test mode.
• Assembling the amplifier. To do this, connect to the power supply.

Assembling any type of speaker amplifiers at home is a doable task that every novice radio amateur can handle. The simplicity lies in the fact that to start assembly you only need to purchase the necessary materials for subsequent soldering. Then you just need to review all possible and available schemes, and choose the one that suits you. The main advantage is savings. After all, buying such a device in a store will cost much more.

Article on the topic: Why the elenberg TV does not work

How to make a sound amplifier from a TV

After disassembling old domestic televisions of the USCT series, there are many blocks of boards, including control units. In addition to the controls, the control units of TVs 3USTST, 4USTST also contain low-frequency amplifier module boards.

The most popular control units were BU3 (Fig. 1), as well as BU411 (Fig. 2) and BU413 (Fig. 3). Each of these blocks contains an A9 board (A9.1), on which the ULF circuit is mounted. as well as some nodes that are not related to ULF. The low frequency amplifier of the BU3 control unit is based on the K174UN7 microcircuit.

This is a fairly old chip with mediocre characteristics. But. nevertheless. The ULF of the BU3 block has an output power of 3 W. at THD 10% (1 W at THD 1.5%) and operating frequency range 6,015,000 Hz with unevenness 6 dB.

In the OOS circuit of the sound amplifier, a tone control operates for low and high frequencies, providing fairly high control efficiency (compared to passive regulators).

Volume control is not provided because volume control on these TVs is carried out electronically in the radio channel module. Therefore, when constructing an independent ULF based on these boards, you will need to make a regular passive volume control using variable resistors. The nominal supply voltage of ULF BU3 is 15V.

But the bass amplifier works normally in the range from 10 to 16.5V. The X4 connectors are directly installed on the ULF A9.2 board. X16 and X8 The remaining connectors are located outside the board and are connected to it with ribbon cables. The connection points for these cables are indicated by numbers in the diagram. The common minus points are points 27. 24. 21, 16. The supply voltage is supplied to point 14.

And the input signal is at points 20 and 19.

TV sound amplifier

Figures 2 and 3 show diagrams of control units BU411 and BU413. which were used in 4USTST TVs. According to the ULF circuits, these blocks are completely identical. The only difference is in the control circuits. In the first case, the control is push-button, in the second it is analogue, with variable resistors. But this has nothing to do with ULF.

A9 boards contain ULF based on the K174UN14 microcircuit, which is more modern than the K174UN7 block BU3. and has significantly better sound quality. But the tone control for low and high frequencies is made according to a passive scheme, which somewhat worsens the depth of its adjustment.

The ULF block BU 411 and BU413 has an output power of 6 W, with a THD of 10% (4 W with a THD of 0.15%) and an operating frequency range of 4,016,000 Hz with an unevenness of 6 dB.

This ULF in the TV circuit is powered by a voltage of 15V. but it is operational in a much wider range of supply voltage from 8 to 18V. In this case, only its maximum output power changes, which at a load with a resistance of 2 Ohms can reach 10 W (at a THD of 10%). The sensitivity of the K174UN14 microcircuit is about 50 mV. which allows the use of a passive tone control. included at the entrance. Volume control is also not provided. Therefore, when designing an ULF based on these boards, you will need to make a regular passive volume control using variable resistors.

Power amplifier on the K174UN14 chip (TDA2003)

On the low-frequency amplifier A9 board of the BU411 or BU 413 unit, connectors X1 and XS1 are directly installed. The remaining connectors are located outside the board and are connected to it with ribbon cables. The connection points for these cables are indicated by numbers in the diagram. The common minus points are points 2. 4, 1, 7. The supply voltage is supplied to point 5. And the input signal is supplied to point 6. Figure 4 shows the circuit of a stereo amplifier based on the A9.2 boards of the BU3 control units.

The input signal comes through connector XI. The resistance values ​​of resistors R1 and R4 depend on the output of the signal source. If it is a linear output, for example. DVD player. then they can be the resistance indicated on the diagram or they can be removed altogether. If the signal is supplied from a telephone output, for example, a pocket MP3 player, then the resistance of these resistors must be reduced to values ​​that ensure normal load of the telephone amplifier (usually 50-100 Ohms is enough).

Resistors R3 and R6 are separate volume controls. The tone controls are not shown in the diagram because they are included in the boards. Circuits R2 C2 and R5 C4 serve to suppress interference with a sampling frequency that may be at the output of a digital signal source. Figure 5 shows a stereo amplifier circuit based on A9 boards of the BU411 or BUZI control units. The power source must produce a constant voltage within the limits indicated in the diagrams, with a maximum current of up to ZA in the diagram in Fig. 3 and up to 5A in the circuit in Fig. 4. It should be noted that the use of different types of ULF boards in the same stereo amplifier is not permissible.

Source: https://www.radiochipi.ru/usilitel-zvuka-iz-televizora/

ULF circuit on TDA1013 chip

Having carefully examined the object of interest, solder the details of adjacent nodes around the perimeter. Not only are they unnecessary, they get in the way.

And finally, we got what we needed. It remains to solder a few wires. To understand which ones and where, we find the passport of that TDA1013 . Need a connection diagram.

We look and read the datasheet: Vp – power plus, from 10 to 40 volts, optimally 14; minus power to the common wire (the “ground” icon is painted on it); in place of Vctr (reminiscent of a schematic representation of a tuning capacitor), you need to select a variable resistor (100k, to adjust the volume); Vi – amplified sound input (its value is from 44 to 69 mV); a speaker is drawn at the output. We transfer the acquired knowledge to “paper” - we complete the first diagram. This is what we will actually have to have. It's time to turn on the soldering iron.

We solder everything we need, but before that, don’t forget to trim the scarf around the perimeter with a file.

We connect a standard speaker (from a disassembled TV), connect a sound source (any, but remember 44-69 mV), the power supply is suitable for 12V and 100 mA (preferably 14V, of course).

Article on the topic: Essay on what I like to watch on TV