Converting a car radio into an amplifier. Non-combustible unch for car radio

Motorists, as you know, prefer to listen to their favorite music in their car quite loudly. However, standard radios can not always maintain high-quality sound when the volume is increased. To avoid this, you can connect a radio amplifier and a subwoofer to the standard device.

Amplifier selection

Since there are only 1-2 12 V batteries in the car, it is necessary to calculate the sound connection to a low-power network. It is to it that the device is connected so that the voltage is increased to 100 V.

When choosing an amplifier for the radio, you need to pay attention to the following factors:

• unit of power - it is necessary that it correspond to the values ​​\u200b\u200bof the rest of the automotive equipment;
• rated power - should be slightly less than the power of standard acoustics for the highest quality sound;

• equality of resistance to the load on the amplifier and the system;
• l minimum frequency range - must be at least 20 Hz.

If you have a fairly modern car, then it can be equipped with a crossover - this is an auxiliary device that will ensure the operation of the amplifier in different modes. Usually, in such machines, you can connect not one, but two amplifiers to the head unit if desired. Most car owners give their preference to Pioneer devices.

Connection

Many motorists prefer to take care of their car on their own, so they ask themselves the question: “How to connect an amplifier to the radio with your own hands?”

Actually, it's not very difficult. The main thing is to follow a number of simple rules and follow the instructions.

First of all, you need to choose a place - it must be dry and have sufficient heat dissipation. This is necessary in order to keep the device working. Usually it is placed deep into the trunk.

The amplifier is connected to the radio as follows:

• Step 1. Laying the signal cable. Usually carried out under the firmware to ensure its safety. The owner of the car chooses the laying route independently as it will be convenient for him.
• Step 2. Laying an additional cable. It is carried out together with a signal cable. It should be noted that they should not come into contact with the wires responsible for the on-board network and under voltage.
• Step 3. Laying the power cable and installing the fuse. It is carried out from the accumulator. In this case, the fuse must be placed as close as possible to it. You can lay the power cable close to the main wiring of the machine.
• Step 4. Connecting the signal cable. Naturally, there are only 2 connectors to which it can be connected. Directly on the standard device, this is the output - that is, Line-Out, and on the amplifier, respectively, the input - Line-In.

• Step 5. Connecting an additional cable. There are also 2 connectors. On the radio it is B + Ant, and on the Remote amplifier. It is imperative to do this, because otherwise the system simply will not work.
• Step 6: Connecting to speakers. If you have a bridge Pioneer, then it has 2 channels. They are connected respectively to the "plus" and "minus" of the speaker.
• Step 7 Installing the Capacitor A storage capacitor is a kind of stabilizer that serves as an auxiliary device for the car's network so that there are no problems with increasing load. It protects both the on-board network and the amplifier from power surges.
• Step 8. Setting up. This stage is strictly individual for each device and depends on the amplifier itself, on the radio and on the presence of a subwoofer.

If an amplifier is not enough for a music lover, then there is another device to improve sound quality at high volumes - this is a subwoofer.

What are subwoofers

• Passive. Connect it to the installed additional amplifier. However, experts do not advise using it, since the filter present in its device removes some of the frequencies. To prevent this from happening, connect a separate device for the subwoofer.
• Active. It has a built-in amplifier, so the passive problem is solved by itself.

Subwoofer connection

1. Step 1. Selecting and connecting the power cable. It is very important to make the right choice, because it will directly affect the sound quality. There is a special table that allows you to choose the cable that matches your device in terms of power. Experts recommend making two wiring at once - to the plus and minus, however, often the minus is attached to the body.
2. Step 2. Installing the fuse. This step will help you keep the subwoofer running if a power surge occurs. The fuse must be placed as close to the battery as possible. At the same time, its minimum power should be 40A, otherwise it simply will not perform its function.
3. Step 3. Connecting to the radio. Two options are possible here - with or without a special output on the head unit:

• In the first case, everything is simple. The subwoofer output is listed in the manual and is usually labeled Out.
• In the second case, connect the subwoofer through the speaker output, and at the same time use a filter.
• The subwoofer itself has a dedicated connector for this step, labeled In.

1. Step 4. Installing the capacitor. If you already have a capacitor installed and you can connect a subwoofer to it, then that's just fine - you do not need to purchase an additional device. You can’t do without this step - it is necessary to unload the onboard network. Therefore, if there is no capacitor, then it must be purchased. You can see the effect of a subwoofer without a capacitor on it with the naked eye - the indicators on the dashboard will glow more dimly.

The choice of amplifier and subwoofer, as well as their connection, is a decision that each motorist must make on his own. You can choose a high-quality and proven device, such as Pioneer, or something less reliable - it's up to you. It is always worth remembering that choosing a new thing and connecting it directly can affect the operation of your car - if you do something wrong, then your dashboard may simply stop working or the entire on-board network may malfunction. Therefore, if you are not sure that you can make the correct connection with your own hands, then it is better to entrust the work to professionals.

At present, a wide range of imported low-frequency integrated amplifiers has become available. Their advantages are satisfactory electrical parameters, the ability to select microcircuits with a given output power and supply voltage, stereo or quad performance with the possibility of bridging.
For the manufacture of a structure based on an integral ULF, a minimum of attachments is required. The use of known-good components ensures high repeatability and typically no further tuning is required.
The given typical switching circuits and the main parameters of integrated ULF are designed to facilitate the orientation and selection of the most suitable microcircuit.
For quadraphonic ULF, the parameters in the bridged stereo connection are not indicated.

TDA1010

Supply voltage - 6...24 V
Output power (Un \u003d 14.4 V, THD \u003d 10%):
RL=2 ohm - 6.4W
RL=4 Ohm - 6.2 W
RL=8 ohm - 3.4W
Quiescent current - 31 mA
Switching scheme

TDA1011

Supply voltage - 5.4...20 V
Maximum current consumption - 3 A
Un=16V - 6.5W
Un=12V - 4.2 W
Un=9V - 2.3 W
Un=6B - 1.0W
SOI (P=1 W, RL=4 Ohm) - 0.2%
Quiescent current - 14 mA
Switching scheme

TDA1013

Supply voltage - 10...40 V
Output power (THD=10%) - 4.2 W
SOI (P=2.5 W, RL=8 Ohm) - 0.15%
Switching scheme

TDA1015

Supply voltage - 3.6 ... 18 V
Output power (RL=4 ohm, THD=10%):
Un=12V - 4.2 W
Un=9V - 2.3 W
Un=6B - 1.0W
SOI (P=1 W, RL=4 Ohm) - 0.3%
Quiescent current - 14 mA
Switching scheme

TDA1020

Supply voltage - 6...18 V

RL=2 ohm - 12W
RL=4 Ohm - 7 W
RL=8 ohm - 3.5 W
Quiescent current - 30 mA
Switching scheme

TDA1510

Supply voltage - 6...18 V
Maximum current consumption - 4 A
THD=0.5% - 5.5 W
THD=10% - 7.0 W
Quiescent current - 120 mA
Switching scheme

TDA1514

Supply voltage - ±10...±30 V
Maximum current consumption - 6.4 A
Output power:
Un \u003d ± 27.5 V, R \u003d 8 Ohm - 40 W
Un \u003d ± 23 V, R \u003d 4 Ohm - 48 W
Quiescent current - 56 mA
Switching scheme

TDA1515

Supply voltage - 6...18 V
Maximum current consumption - 4 A
RL=2 ohm - 9W
RL=4 ohm - 5.5W
RL=2 ohm - 12W
RL4 Ohm - 7 W
Quiescent current - 75 mA
Switching scheme

TDA1516

Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Un =14.4 V, THD=0.5%):
RL=2 ohm - 7.5W
RL=4 Ohm - 5W
Output power (Un =14.4 V, THD=10%):
RL=2 ohm - 11W
RL=4 Ohm - 6 W
Quiescent current - 30 mA
Switching scheme

TDA1517

Supply voltage - 6...18 V
Maximum current consumption - 2.5 A
Output power (Un=14.4B RL=4 ohm):
THD=0.5% - 5 W
THD=10% - 6 W
Quiescent current - 80 mA
Switching scheme

TDA1518

Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Un =14.4 V, THD=0.5%):
RL=2 ohm - 8.5W
RL=4 Ohm - 5W
Output power (Un =14.4 V, THD=10%):
RL=2 ohm - 11W
RL=4 Ohm - 6 W
Quiescent current - 30 mA
Switching scheme

TDA1519

Supply voltage - 6...17.5 V
Maximum current consumption - 4 A
Output power (Up=14.4 V, THD=0.5%):
RL=2 ohm - 6 W
RL=4 Ohm - 5W
Output power (Un =14.4 V, THD=10%):
RL=2 ohm - 11W
RL=4 Ohm - 8.5W
Quiescent current - 80 mA
Switching scheme

TDA1551

Supply voltage -6...18 V
THD=0.5% - 5 W
THD=10% - 6 W
Quiescent current - 160 mA
Switching scheme

TDA1521

Supply voltage - ±7.5...±21 V
Output power (Un=±12V, RL=8 ohm):
THD=0.5% - 6 W
THD=10% - 8 W
Quiescent current - 70 mA
Switching scheme

TDA1552

Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Un = 14.4 V, RL = 4 ohms):
THD=0.5% - 17 W
THD=10% - 22 W
Quiescent current - 160 mA
Switching scheme

TDA1553

Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Up=4.4 V, RL=4 Ohm):
THD=0.5% - 17 W
THD=10% - 22 W
Quiescent current - 160 mA
Switching scheme

TDA1554

Supply voltage - 6...18 V
Maximum current consumption - 4 A
THD=0.5% - 5 W
THD=10% - 6 W
Quiescent current - 160 mA
Switching scheme

TDA2004

Output power (Un=14.4V, THD=10%):
RL=4 Ohm - 6.5W
RL=3.2 ohm - 8.0 W
RL=2 ohm - 10W
RL=1.6 ohm - 11W
KHI (Un=14.4V, P=4.0 W, RL=4 Ohm) - 0.2%;
Bandwidth (by level -3 dB) - 35...15000 Hz
Quiescent current -<120 мА
Switching scheme

TDA2005

Dual integrated ULF, designed specifically for use in a car and allowing operation at a low-resistance load (up to 1.6 Ohm).
Supply voltage - 8...18 V
Maximum current consumption - 3.5 A
Output power (Up = 14.4 V, THD = 10%):
RL=4 Ohm - 20W
RL=3.2 Ohm - 22W
SOI (Up = 14.4 V, P = 15 W, RL = 4 Ohm) - 10%
Bandwidth (by level -3 dB) - 40...20000 Hz
Quiescent current -<160 мА
Switching scheme

TDA2006

The pinout matches the pinout of the TDA2030 chip.
Supply voltage - ±6.0...±15 V
Maximum current consumption - 3 A
Output power (Ep=±12V, THD=10%):
at RL=4 Ohm - 12 W
at RL=8 Ohm - 6...8 W SOI (Ep=±12V):
at P=8 W, RL= 4 Ohm - 0.2%
at P=4 W, RL= 8 Ohm - 0.1%
Bandwidth (by level -3 dB) - 20...100000 Hz
Consumption current:
at Р=12 W, RL=4 Ohm - 850 mA
at P=8 W, RL=8 Ohm - 500 mA
Switching scheme

TDA2007

A dual integrated ULF with a single in-line arrangement of pins, specially designed for use in television and portable radio receivers.
Supply voltage - +6...+26 V
Quiescent current (Ep=+18 V) - 50...90 mA
Output power (THD=0.5%):
at En=+18 V, RL=4 Ohm - 6 W
at En=+22 V, RL=8 Ohm - 8 W
SOI:
at En=+18 V P=3 W, RL=4 Ohm - 0.1%
at En=+22 V, P=3 W, RL=8 Ohm - 0.05%
Bandwidth (by level -3 dB) - 40...80000 Hz
Switching scheme

TDA2008

Integral ULF, designed to operate on a low-resistance load, providing a high output current, very low harmonic content and intermodulation distortion.
Supply voltage - +10...+28 V
Quiescent current (Ep=+18 V) - 65...115 mA
Output power (Ep=+18V, THD=10%):
at RL=4 Ohm - 10...12 W
at RL=8 Ohm - 8 W
THD (Ep= +18 V):
at Р=6 W, RL=4 Ohm - 1%
at P=4 W, RL=8 Ohm - 1%
Maximum consumption current - 3 A
Switching scheme

TDA2009

Dual integrated ULF, designed for use in high-quality music centers.
Supply voltage - +8...+28 V
Quiescent current (Ep=+18 V) - 60...120 mA
Output power (Ep=+24 V, THD=1%):
at RL=4 Ohm - 12.5 W
at RL=8 Ohm - 7 W
Output power (Ep=+18 V, THD=1%):
at RL=4 Ohm - 7 W
at RL=8 Ohm - 4 W
SOI:
at Ep = +24 V, P = 7 W, RL = 4 Ohm - 0.2%
at En= +24 V, P=3.5 W, RL=8 Ohm - 0.1%
at Ep = +18 V, P = 5 W, RL = 4 Ohm - 0.2%
at En= +18 V, P=2.5 W, RL=8 Ohm - 0.1%
Maximum consumption current - 3.5 A
Switching scheme

TDA2030

Integral ULF providing high output current, low harmonics and intermodulation distortion.
Supply voltage - ±6...±18 V
Quiescent current (Ep=±14 V) - 40...60 mA
Output power (Ep=±14 V, THD=0.5%):
at RL=4 Ohm - 12...14 W
at RL=8 Ohm - 8...9 W
SOI (Ep=±12V):
at P=12 W, RL=4 Ohm - 0.5%
at P=8 W, RL=8 Ohm - 0.5%
Bandwidth (by level -3 dB) - 10...140000 Hz
Consumption current:
at P=14 W, RL=4 Ohm - 900 mA
at P=8 W, RL=8 Ohm - 500 mA
Switching scheme

TDA2040

Integral ULF providing high output current, low harmonics and intermodulation distortion.
Supply voltage - ±2.5...±20 V
Quiescent current (Ep=±4.5...±14 V) - mA 30...100 mA
Output power (Ep=±16 V, THD=0.5%):
at RL=4 Ohm - 20...22 W
at RL=8 Ohm - 12 W
SOI (Ep=±12V, P=10W, RL=4 Ohm) - 0.08%
Maximum consumption current - 4 A
Switching scheme

TDA2050

Integral ULF, providing high output power, low harmonics and intermodulation distortion. Designed to work in Hi-Fi stereo complexes and high-end TVs.
Supply voltage - ±4.5...±25 V
Quiescent current (Ep=±4.5...±25 V) - 30...90 mA
Output power (Ep=±18, RL=4 Ohm, THD=0.5%) - 24...28 W
THD (Ep=±18V, P=24W, RL=4 Ohm) - 0.03...0.5%
Bandwidth (by level -3 dB) - 20...80000 Hz
Maximum consumption current - 5 A
Switching scheme

TDA2051

Integral ULF, which has a small number of external elements and provides a low content of harmonics and intermodulation distortion. The output stage operates in class AB, which allows you to get more output power.
Output power:
at Ep=±18 V, RL=4 Ohm, SOI=10% - 40 W
at Ep=±22 V, RL=8 Ohm, SOI=10% - 33 W
Switching scheme

TDA2052

Integral ULF, the output stage of which operates in class AB. Allows a wide range of supply voltages and has a large output current. It is intended for work in television and radio receivers.
Supply voltage - ±6...±25 V
Quiescent current (En = ±22 V) - 70 mA
Output power (Ep = ±22 V, THD = 10%):
at RL=8 Ohm - 22 W
at RL=4 Ohm - 40 W
Output power (En = 22 V, THD = 1%):
at RL=8 Ohm - 17 W
at RL=4 Ohm - 32 W
SOI (with a bandwidth of -3 dB 100 ... 15000 Hz and Pout = 0.1 ... 20 W):
at RL=4 Ohm -<0,7 %
at RL=8 Ohm -<0,5 %
Switching scheme

TDA2611

Integral ULF, designed to work in household equipment.
Supply voltage - 6...35 V
Quiescent current (Ep=18 V) - 25 mA
Maximum consumption current - 1.5 A
Output power (THD=10%): at Ep=18 V, RL=8 Ohm - 4 W
at Ep=12V, RL=8 0m - 1.7 W
at Ep=8.3 V, RL=8 Ohm - 0.65 W
at Ep=20 V, RL=8 Ohm - 6 W
at Ep=25 V, RL=15 Ohm - 5 W
SOI (at Рout=2 W) - 1%
Bandwidth - >15 kHz
Switching scheme

TDA2613

SOI:
(Ep=24 V, RL=8 Ohm, Pout=6 W) - 0.5%
(Ep=24 V, RL=8 Ohm, Рout=8 W) - 10%
Quiescent current (Ep=24 V) - 35 mA
Switching scheme

TDA2614

Integral ULF, designed to work in household equipment (television and radio receivers).
Supply voltage - 15...42 V
Maximum consumption current - 2.2 A
Quiescent current (Ep=24 V) - 35 mA
SOI:
(Ep=24 V, RL=8 Ohm, Pout=6.5 W) - 0.5%
(Ep=24 V, RL=8 Ohm, Pout=8.5 W) - 10%
Bandwidth (by level -3 dB) - 30...20000 Hz
Switching scheme

TDA2615

Dual ULF, designed to work in stereo radios or TVs.
Supply voltage - ±7.5...21 V
Maximum current consumption - 2.2 A
Quiescent current (Ep=7.5...21 V) - 18...70 mA
Output power (Ep=±12 V, RL=8 ohm):
THD=0.5% - 6 W
THD=10% - 8 W
Bandwidth (by level-3 dB and Рout=4 W) - 20...20000 Hz
Switching scheme

TDA2822

Dual ULF, designed to work in portable radio and television receivers.

Quiescent current (Ep=6 V) - 12 mA
Output power (THD=10%, RL=4 ohm):
En \u003d 9V - 1.7 W
En \u003d 6V - 0.65 W
En \u003d 4.5V - 0.32 W
Switching scheme

TDA7052

ULF, designed to work in battery-powered portable audio devices.
Supply voltage - 3...15V
Maximum current consumption - 1.5A
Quiescent current (E p \u003d 6 V) -<8мА
Output power (Ep \u003d 6 V, R L \u003d 8 Ohm, THD \u003d 10%) - 1.2 W

Switching scheme

TDA7053

Dual ULF, designed to work in portable audio devices, but can also be used in any other equipment.
Supply voltage - 6...18 V
Maximum current consumption - 1.5 A
Quiescent current (E p \u003d 6 V, R L \u003d 8 Ohms) -<16 mA
Output power (E p \u003d 6 V, RL \u003d 8 Ohm, THD \u003d 10%) - 1.2 W
SOI (E p \u003d 9 V, R L \u003d 8 Ohm, Pout \u003d 0.1 W) - 0.2%
Operating frequency range - 20...20000 Hz
Switching scheme

TDA2824

Dual ULF, designed to work in portable radio and television receivers
Supply voltage - 3...15 V
Maximum current consumption - 1.5 A
Quiescent current (Ep=6 V) - 12 mA
Output power (THD=10%, RL=4 ohm)
En \u003d 9 V - 1.7 W
En \u003d 6 V - 0.65 W
En \u003d 4.5 V - 0.32 W
SOI (Ep=9 V, RL=8 Ohm, Pout=0.5 W) - 0.2%
Switching scheme

TDA7231

ULF with a wide range of supply voltages, designed to work in portable radios, cassette recorders, etc.
Supply voltage - 1.8 ... 16 V
Quiescent current (Ep=6 V) - 9 mA
Output power (THD=10%):
En=12V, RL=6 Ohm - 1.8 W
En=9B, RL=4 Ohm - 1.6W
Ep=6 V, RL=8 Ohm - 0.4 W
Ep=6 V, RL=4 Ohm - 0.7 W
En \u003d Z V, RL \u003d 4 Ohm - 0.11 W
Ep=3 V, RL=8 Ohm - 0.07 W
SOI (Ep=6 V, RL=8 Ohm, Pout=0.2 W) - 0.3%
Switching scheme

TDA7235

ULF with a wide range of supply voltages, designed to work in portable radio and television receivers, cassette recorders, etc.
Supply voltage - 1.8...24 V
Maximum current consumption - 1.0 A
Quiescent current (Ep=12 V) - 10 mA
Output power (THD=10%):
Ep=9 V, RL=4 Ohm - 1.6 W
Ep=12 V, RL=8 Ohm - 1.8 W
Ep=15 V, RL=16 Ohm - 1.8 W
Ep=20 V, RL=32 Ohm - 1.6 W
SOI (Ep=12V, RL=8 Ohm, Pout=0.5 W) - 1.0%
Switching scheme

TDA7240

Quiescent current (Ep=14.4 V) - 120 mA
RL=4 Ohm - 20W
RL=8 Ohm - 12W
SOI:
(Ep=14.4 V, RL=8 Ohm, Pout=12W) - 0.05%
Switching scheme

TDA7241

Bridge ULF, designed for use in car radios. It has protection against short circuit in the load, as well as against overheating.
Maximum supply voltage - 18 V
Maximum current consumption - 4.5 A
Quiescent current (Ep=14.4 V) - 80 mA
Output power (Ep=14.4 V, THD=10%):
RL=2 ohm - 26W
RL=4 Ohm - 20W
RL=8 Ohm - 12W
SOI:
(Ep=14.4 V, RL=4 Ohm, Pout=12 W) - 0.1%
(Ep=14.4 V, RL=8 Ohm, Pout=6 W) - 0.05%
Level bandwidth -3 dB (RL=4 Ohm, Рout=15 W) - 30...25000 Hz
Switching scheme

TDA1555Q

Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Up = 14.4 V. RL = 4 ohms):
- THD=0.5% - 5 W
- THD=10% - 6 W Quiescent current - 160 mA
Switching scheme

TDA1557Q

Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Up = 14.4 V, RL = 4 ohms):
- THD=0.5% - 17 W
- THD=10% - 22 W
Quiescent current, mA 80
Switching scheme

TDA1556Q

Supply voltage -6...18 V
Maximum current consumption -4 A
Output power: (Up=14.4 V, RL=4 Ohm):
- THD=0.5%, - 17 W
- THD=10% - 22 W
Quiescent current - 160 mA
Switching scheme

TDA1558Q

Supply voltage - 6..18 V
Maximum current consumption - 4 A
Output power (Up=14 V, RL=4 Ohm):
- THD=0.6% - 5 W
- THD=10% - 6 W
Quiescent current - 80 mA
Switching scheme

TDA1561

Supply voltage - 6...18 V
Maximum consumed current - 4 A
Output power (Up=14V, RL=4 Ohm):
- THD=0.5% - 18 W
- THD=10% - 23 W
Quiescent current - 150 mA
Switching scheme

TDA1904

Supply voltage - 4...20 V
Maximum consumed current - 2 A
Output power (RL=4 ohm, THD=10%):
- Up=14 V - 4 W
- Up=12V - 3.1 W
- Up \u003d 9 V - 1.8 W
- Up \u003d 6 V - 0.7 W
SOI (Up=9 V, P<1,2 Вт, RL=4 Ом) - 0,3 %
Quiescent current - 8...18 mA
Switching scheme

TDA1905

Supply voltage - 4...30 V
Maximum current consumption - 2.5 A
Output power (THD=10%)
- Up=24 V (RL=16 Ohm) - 5.3 W
- Up=18V (RL=8 Ohm) - 5.5 W
- Up=14 V (RL=4 Ohm) - 5.5 W
- Up \u003d 9 V (RL \u003d 4 Ohm) - 2.5 W
SOI (Up=14 V, P<3,0 Вт, RL=4 Ом) - 0,1 %
Quiescent current -<35 мА
Switching scheme

TDA1910

Supply voltage - 8...30 V
Maximum consumed current - 3 A
Output power (THD=10%):
- Up=24 V (RL=8 Ohm) - 10 W
- Up=24 V (RL=4 Ohm) - 17.5 W
- Up=18 V (RL=4 Ohm) - 9.5 W
SOI (Up=24 V, P<10,0 Вт, RL=4 Ом) - 0,2 %
Quiescent current -<35 мА
Switching scheme

TDA2003

Supply voltage - 8...18 V
Maximum current consumption - 3.5 A
Output power (Up=14V, THD=10%):
- RL=4.0 Ohm - 6 W
- RL=3.2 Ohm - 7.5 W
- RL=2.0 Ohm - 10 W
- RL=1.6 Ohm - 12 W
SOI (Up=14.4 V, P<4,5 Вт, RL=4 Ом) - 0,15 %
Quiescent current -<50 мА
Switching scheme

TDA7056

ULF, designed to work in portable radio and television receivers.
Supply voltage - 4.5 ... 16 V Maximum current consumption - 1.5 A
Quiescent current (E p \u003d 12 V, R \u003d 16 Ohm) -<16 мА
Output power (E P \u003d 12 V, R L \u003d 16 Ohm, THD \u003d 10%) - 3.4 W
SOI (E P \u003d 12 V, R L \u003d 16 Ohm, Pout \u003d 0.5 W) - 1%
Operating frequency range - 20...20000 Hz
Switching scheme

TDA7245

TEA0675

TEA0678

TEA0679

TDA0677

TEA6360

TDA1074A

TEA5710

Most of all, a car enthusiast appreciates reliability on the road, at the same time, breakdowns of "stamped" imported car radios often occur. Below is a ULF circuit that replaces a burned-out imported one - just connect the input of the circuit to the volume control of the device being repaired. After that, you will not need to understand the installation, change the failed parts - the most "tender" part of the car radio - the power amplifier - will become incombustible! Some redundancy in detail gave the scheme two advantages over other similar schemes:
- the output voltage range is almost equal to the voltage in the on-board network,
- overload and even short circuit on the output, the amplifier endures "with a smile", without complex electronic protection circuits. On fig. 1 shows a schematic diagram of the ULF (in brackets are the pins of the microcircuit involved in the second channel), if the radio tape recorder is really, without deception, stereophonic. From the volume control available in the car radio, the signal is fed to the direct input of the DA1 microcircuit - an operational amplifier with a high gain, a high-frequency margin, an input stage power stabilizer and output overload protection.

These properties of a two-channel microcircuit made it possible to get rid of power interference in the input stage in a simple way and simply stabilize the output at a constant voltage, without worrying about the survivability of the microcircuit. From the output of the IC, the signal is fed to the bases of two germanium transistors of different conductivity of the phase-inverted stage VT1, VT2, in this way distortions of the "step" type are suppressed without selecting elements. The emitters of said transistors are connected to the midpoint of resistors R1, R2 of the supply voltage divider to limit currents and protect all transistors of a given channel from burnout. From the collectors VT1 and VT2, various half-waves of the signal enter the bases of the output transistors VT3 and VT4, mounted on a common radiator. The emitters of the output transistors include resistors R6 and R7, which limit the currents in the circuits of the output and output transistors. The same resistors limit the through current when a faulty - "broken" transistor is installed in the circuit. The variable component of the output signal through the capacitor C4 is supplied to the head B1. It should be noted that it is impossible to "save" on the capacitance of this capacitor! For the operation of all cascades in a linear mode, it is necessary to limit the “bass” according to the available heads B1 by reducing the capacitance of the capacitor C1 so that the playback volume increases, but the lower frequencies are not noticeably suppressed. This operation is best performed while listening to the sound inside the car. The more we limit the low frequencies, which are very poorly reproduced on bad heads, the more the maximum undistorted sound power will increase, and the intermodulation distortion of audible frequencies will decrease by "inaudible" - not reproducible heads. Negative feedback on direct and alternating voltage from the output to the inverting input is transmitted from the divider R3, R4, by selecting R4 we output the amplifier mode to half the supply voltage at point "A".

Figure 2 shows an improved circuit of this divider, in which R4 is connected by direct voltage to the "body", and by alternating voltage - to the dynamic head. With this feedback scheme, sound distortion at low frequencies is reduced. Resistor R9 is needed here to maintain the amplifier mode when the dynamic heads are turned off. The depth of negative feedback on audio frequencies and the gain of the circuit are adjusted by resistor R5 so that the sound of the receiver, as well as the cassette with a weak recording level, leads, at the upper position of the volume control, to a uniform limitation of the oscillogram taken at point "B" (at this time, you should listen to sound distortion). With this setting, distortion in various operating modes will not be too large and, at the same time, there will be a small margin of volume. Due to the broadband of the microcircuit and the use of low-frequency germanium transistors to suppress excitation at high frequencies, it was necessary to take the OOS signal from the emitters VT1 VT2 and bring it to the inverse input of the microcircuit through capacitor C2 (with the correct layout of the amplifier, the capacitance of this capacitor can be reduced, and if it is incorrect - significant capacitive coupling of the output circuits with the "direct" input of the microcircuit - you will have to increase the capacitance C2). The occurrence of generation is seen on the oscillogram as a "bifurcation" of the voltage curve and is accompanied by a sharp decrease in power and sound quality. To protect the microcircuit from voltage surges in the on-board network (the operation of the ignition system, the generator with a relay-regulator), elements R8, C5, C6 are used.

Due to the protection of the circuit from harmful influences, there are no big restrictions in installation. One condition must be met: since the amplifier does not invert the signal, it is necessary to shield the wire coming from the volume control, capacitor C1 well and choose the correct common zero point (connection of the radio and power amplifier cases). Installation is carried out in a metal box measuring 100x70x30 or slightly larger. The output transistors are mounted on the top insulated radiator cover, they are connected to the circuit with a flat 5-wire harness. The rest of the installation is made on one side of the board from double-sided fiberglass (the second side - the case is pressed against the wall of the box).

Several rectangular sections are cut or etched on the board: direct and inverse inputs of the microcircuit, microcircuit power, on-board network power, microcircuit output and base-cases VT1 and VT2 soldered to it, feedback circuits. The connections between these areas are best made in detail, so that isolated "islands" do not disturb the ground surface of the remaining board. The microcircuit, in which extra pins are bitten off, is installed on one edge of the board, and the output capacitors are on the opposite. It is possible, upon completion of the installation, to cover the microcircuit with the input circuits with a grounded rectangle made of foil fiberglass (insulated side to the parts). The output transistors in a plastic case are pressed against the radiator cap, as usual. Their collector leads are bitten off, and the conclusions of the emitters and bases are soldered to a strip of foil fiberglass (the insulating tracks are cut out or etched). The output of the collectors is carried out through a screw securing one of the transistors, or securing a strip of fiberglass. With this method of installation, it is impossible to break the terminals of the transistors or close them. Resistors R6 and R7 can also be mounted on the lid, or in the main unit - it depends on the dimensions of the box and parts.

FORMING

If the preparatory operations mentioned above are completed, it remains to select the fuse in the power circuit so that when the amplifier output is short-circuited, the fuse does not blow immediately, but after tens of seconds. The circuit is protected from overloads and short circuits, but it is better if the tape recorder, which works without the control of the car driver, is de-energized in an emergency. In the future, you can connect any heads in any quantity to the output of the amplifier. Silence will indicate a faulty head, and a decrease in volume will indicate an incorrect connection. It is very difficult to burn the circuit, but still during the adjustment period, check the heating of the output transistors, resistors R6 and R7 in maximum power modes and with a short circuit of the output. Recall that the wrong choice of points for connecting the neutral wire to the tape recorder and power amplifier, or too much length of this wire, can ruin all the work. So, I gave one copy to a tuned car enthusiast, who began to "dare", increasing the length of the wires, and then came with a complaint that "suddenly" it became bad to "play"!

REINFORCEMENT OF AN EXISTING GOOD RADIO

If you think that the transistorized ULF of your radio (Fig. 3) gives little power, but has not yet failed :-), then the work is greatly simplified (we clarify: we mean the ULF version, in which weak output transistors are pressed against the case- heat sink). Indeed, the circuit has an amplifier with a small voltage gain (approximately 2 V undistorted voltage amplitude), feedback circuits, and insufficiently powerful output elements. To get the output voltage range within the supply voltage (as in the circuit of Fig. 1), it is necessary to add an output stage on powerful transistors, use the existing CFO circuits, while supplying only about a third of the alternating output voltage to the latter.

Figure 4 shows only the newly introduced elements. Capacitor C1, which served as a separator, as having a clearly insufficient capacity, is left only in the OOS circuit. In the collector circuits VT1, VT2, it is necessary to cut the current-carrying tracks. To connect the "old" circuit to the new output stage, a flat bundle of 5 wires is suitable if C1 is transferred to a new board, or of 6 if C1 remains in the "old" place. Transistors VT3, VT4, connected with a common emitter, provide current and voltage amplification and should have approximately equal current transfer coefficients.

Capacitor C2 is separating in the dynamic head circuit. The voltage divider R5R6 brings through C1 the variable component of the output signal to the OOS circuits. Through R7, a constant potential is supplied to the same point at the connection point of the collectors of the output transistors. You can experiment with reducing the capacitance of C1 to increase intelligibility and subjective loudness while limiting the lower audio frequencies (be sure to check if gain asymmetry occurs).

FORMING

If the output transistors are heated, or the current consumed in the pause is too high, it may be necessary to install one of the two resistors R8, R9. If the circuit of the E-B of one of the output transistors sharply reduces the quiescent current, then a resistor is required in this particular shoulder (select by increasing the value from the minimum). In a properly tuned amplifier, the average potential of the mid-point of the output does not change much with changes in the input signal level. The second important sign of the correct setting is the symmetry of the limitation of the sinusoid at a high signal level, and the third is the undistortedness of the sinusoid when the load is connected at any level from 0 to the maximum (at which a symmetrical limitation occurs), if necessary, correct R8, R9.

It may turn out that small distortions still remain (after all, we did not redo the entire ULF circuit), but even in this case, the volume and sound quality will noticeably improve, and there is still less editing than in the circuit in Fig. one

The installation of this circuit in my version (in the radio tape recorder there is one board installed on the side of the tape recorder) easily fit inside the existing radio case. The board made of foil fiberglass occupies the entire space behind the tape drive mechanism and is attached to the bottom of the case. The output transistors are mounted far apart so that the U-shaped strip of aluminum and tin plate connecting their cases captures more air for cooling. To improve heat dissipation, it is better to use two such structures pressed against different sides of the metal part of the transistors. In space, they must be spaced apart, and the "horns" bent so that the largest possible volume of air comes into contact with the radiators. In addition to two attachment points (transistor collectors), for mechanical strength, such a radiator must be soldered to the board in one or two places. Since the board is attached to the case, the parts are mounted without drilling holes - the curved leads of the parts are soldered to the board sections. There must be zero potential in the places where the board is attached.

Attention! It is necessary to ensure that the screws securing the upper removable cover of the radio do not close the installation of a new part of the ULF to the case.

Nikolay Goreiko, Ladyzhin, Vinnytsia region "Radiohobby" N 3.99

List of radio elements

Many motorists, for certain reasons, are in no hurry to get rid of old radio tape recorders that have served their time. At the same time, they are not at all concerned about the outdated design of this device. The cassette receiver of the car radio may not have been used for its intended purpose for many years. In this case, there are only three reasons why the owner of a rarity can treat him with such love.

This is deafness, sentimentality, or the inability to purchase a new car radio. Unfortunately, in some cases, the cost of the car radio may exceed the cost of the car itself. If only doctors can help deal with the first two reasons, then in the third option you can find an easier way out. This article will provide a detailed one from an ordinary car radio.

Before converting a car radio into an amplifier, ask yourself a few simple questions:
— Does the FM tuner have sufficient sensitivity?
- Does the owner suit the cavity and output power of the radio?

If you answered yes to both questions, it means that you have just appreciated the benefits of such a music box. It should include a control unit, a digital tuner and a quad amplifier. And here the fun begins - how to independently make an amplifier from a car radio. Modern technologies can be used to solve this issue with great success. So, for example, you can connect a digital sound source to an old car radio.

There are several options for using an old car radio.

Option one
If you have a really old car radio, then most likely it does not have AUX-IN and USB outputs. In this case, we can use the Car Cassette Tape Adapter.

This adapter technically and visually looks like an analogue of a cassette. Surely many people may be surprised at the first glance at this device. All the charm and genius of this device can be appreciated only after its connection. The principle of operation of this adapter is as follows: you insert it into the car radio deck like a regular cassette. At the same time, the head of the adapter comes into contact with the head of the player, and if at the same time a sound source is connected through the mini-jack, then the output in the speakers produces a pretty good sound.

The result, in general, is pretty good, especially when you consider how much you managed to save on the purchase of a new car radio. The advantages of this method are low cost, interesting idea, good sound. Also, with this method, the cigarette lighter socket remains free, and this, you see, is very important in some cases. The disadvantages of this method include a not very reliable layout, protruding cables and the sound of the tape mechanism during playback.

Option two
If your car radio does not have a cassette unit or is defective, you can use an FM transmitter as an alternative sound source. For the full operation of this device, you must insert a drive with music files into a USB port or connect an audio source via AUX-IN. Next, you need to make room in the cigarette lighter for the transmitter and tune the car radio to the same frequency with the FM transmitter.

The advantages of this method include ease of installation and ease of use, as well as ample opportunities for connecting various sources. But this option also has its drawbacks. Firstly, with this connection method, the cigarette lighter port is constantly busy, and secondly, if the method is poorly executed, extraneous noise may appear.

There is another way by which you can make an amplifier from an ordinary outdated car radio for modern digital devices: tablets, laptops, and other devices with Bluetooth adapters. To implement this method, you must use the Wireless Bluetooth Music Receiver adapter. A prerequisite is that the head unit has an AUX-IN port. Otherwise, you can use other adapters or adapters that are able to simulate additional stereo audio inputs.

The last of the old car radio is the most difficult. First, you need to remove the old radio from its location and disconnect all wires and connectors. Further, in order to get rid of noise and interference, we solder and isolate the positive wire. Now we determine the location of the AUX-IN input. The location of the input is determined by studying the technical documentation for the preamplifier chip. The audio cable wires must be soldered to the right InRight and left InLeft channels. The InGND pin must be soldered to the radio case.

I, like many here, became the owner of this car, everything suits me, but the sound is somehow not the same, as if it works under load, there are no normal highs, low ones are also really absent. There is a predominance of medium frequencies, which is not the case for audio equipment that should brighten up the road. With such a sound, usually either your head starts to hurt, or you get even more tired from the road. Therefore, they are probably not so popular, and probably everyone wants to change them. Although many try to fix this problem by replacing the speakers, in my experience this is more a consequence of the problem and not the problem itself!

So, instead of putting in acoustics and tricking something with the replacement of the mayfun, there is an elementary way out! True, it is a little expensive for someone, but for someone it is not.
And so, what is required is the replacement of the rear speakers with more powerful ones for your taste and 4 ohms, it is better to check with a tester a little more than 4 ohms is allowed, less is not
Second and most important. This is a replacement for the standard amplifier of the car radio that is in it, inside, I am currently engaged in the selection of the amplifier microcircuit according to the datasheets.
In the car radio, a Chinese amplifier is installed LA47201- such a microcircuit is in the JVC KD-G425 and in many other similar mayfun, the price of such a microcircuit in stores is about LA47201 - 245.60 rubles.
I worked for more than a year and a half in a car radio repair service center. In JVC I put mikruhi from the pioneer and into the pioneer from JVC, now I will select an analogue and post information on the replacement.
Well, as expected, the microcircuit is out of the ordinary weak, hence the attitude to the speakers, as the manufacturer writes the recommended 8 ohm, but it can also work with 4 ohm
You can supply any available from: TDA7381-7386, TDA7560, TA8263-8268, TA8271-8277, TB2901-2906, LA47501-LA47515, LA4743, etc. The only thing, pay attention to 1, 10, 16, 25 legs, well, they have different power - this is taken from the forum, it takes a long time to write (It was meant that microcircuits can be fake and their pinouts can also be different)! the price of such microcircuits is up to 500 rubles
I'll just add, I changed this chip to Pal007, the price of such a microcircuit in Novosibirsk is from 900 to 2000 t r stands in all pioneers, the difference is in the most expensive radio models, only in a linear better amplifier!

At the moment I’m charging the batteries for the camera, I’ll post pictures later for those who understand, the rest are a warning that all the work done to replace the amplifier chip can, if it’s soldered and soldered, damage the printed circuit board and lead to a short circuit. (again, I recommend contacting people who know how to solder such microcircuits so that there are no problems in the future))
Well, that's it, I redid it, and about the miracle of such a sound, I'm on a SONY pile m9900 didn't hear. The sound became more powerful, the bottoms even with regular speakers, began to pump!!! The quality has increased by 100 times, and not by 5 - 10 percent, the only thing is not to listen to the full with such a microcircuit, it's bad for the speakers. And so, people, you have no idea how it began to sound! And if you put new acoustics instead of regular ones, you will definitely be pleasantly surprised, and at the same time everything remains under warranty, the radio tape recorder is regular 🙂 The main thing is to do everything with high quality, and remove traces of soldering with alcohol. 🙂

Here, as promised, a photo of my modifications for today with my mafon, I was very pleased!
And I wanted to say about the 25th leg, where I show with a screwdriver the road that I cut off above, this is done so that there is no interference when the ignition is turned off, the interference from my alarm ....!
To more accurately remove a standing microcircuit, you can use suction, either gently break it out or cut it out with a scalpel, I dropped it just in case, it will come in handy for experiments or how it will be.
It is better to install the PAL007C microcircuit, it pumps the bottoms well, the only thing that was missing was the high ones, but this is solved simply by installing tweeters. Now, at maximum sound power, namely 33 with bass at zero, the speakers have no distortion and power failures!
At higher basses, it also works well, but the speakers here already feel like there are not enough.
Once again, when choosing acoustics, you can come with a digital tester and measure the resistance of the acoustics you want to take. It should not be lower than 4 ohms! This is the course of companies, real acoustics are slightly more than 4 ohms, which means that the number of turns is greater than in those where the resistance is lower, which means that the reproducible frequency range also narrows. So regular 8 ohm speakers have a higher range of reproducible frequencies. But only at Medium and Low frequencies, HF is very lacking, but the quality with such a remake simply cannot be compared with what it was, that's all!

If you have any questions about the conversion, ask me to help in any way I can!