Seal
Burnt amplifier TDA 7377
The topic of this article is inspired by the fairly frequent repair of car radios with malfunctions, lack of sound or large distortions during playback. At the same time, the models are all new with a USB player, which has been very popular lately, and a TDA7377 output stage chip. The reason for everyone is basically the same, the amplifier in the radio burned out.
Diagnostics takes a little time and when explaining to the client the cause of the malfunction, you almost always get a question about why the amplifier burned out. And since the contingent that applied is young, there is only one reason why the amplifier burns out - excessively cranked up playback volume.
There is nothing wrong with turning up the volume all the way, provided that the circuit is drawn up correctly and all loads on the circuit elements are taken into account. Of course, I’m not an engineer, but in this case the manufacturer’s savings are simply surprising. Let's look at the TDA7377 connection diagram in car radios (Erisson RU-1036 and Soundmax SM-CCR3033):
Now let's look at a typical TDA 7377 connection diagram taken from its datasheet: 
It is immediately noticeable that the manufacturer saved on two capacitors and perhaps the circuit would have been more reliable if the existing capacitors had been of larger capacity with a voltage reserve. Can an amplifier with such shortcomings burn out, yes it can.
It may also happen that one channel on the amplifier or two burned out due to a malfunction of one capacitor. This will also ultimately lead to overheating and the amplifier in the radio will burn out.
When repairing and replacing the amplifier, I installed capacitors of larger capacity, and at the customer’s request, converted them to four capacitors or switched them to bridge capacitors.
Currently, a wide range of imported integrated low-frequency amplifiers has become available. Their advantages are satisfactory electrical parameters, the ability to select microcircuits with a given output power and supply voltage, stereophonic or quadraphonic design with the possibility of bridge connection.
To manufacture a structure based on an integral ULF, a minimum of attached parts is required. The use of known-good components ensures high repeatability and, as a rule, no additional tuning is required.
The given typical switching circuits and main parameters of integrated ULFs are designed to facilitate the orientation and selection of the most suitable microcircuit.
For quadraphonic ULFs, the parameters in bridged stereo are not specified.
TDA1010
Supply voltage - 6...24 V
Output power (Un =14.4 V, THD = 10%):
RL=2 Ohm - 6.4 W
RL=4 Ohm - 6.2 W
RL=8 Ohm - 3.4 W
Quiescent current - 31 mA
Connection diagram
TDA1011
Supply voltage - 5.4...20 V
Maximum current consumption - 3 A
Un=16V - 6.5 W
Un=12V - 4.2 W
Un=9V - 2.3 W
Un=6B - 1.0 W
SOI (P=1 W, RL=4 Ohm) - 0.2%
Quiescent current - 14 mA
Connection diagram
TDA1013
Supply voltage - 10...40 V
Output power (THD=10%) - 4.2 W
THD (P=2.5 W, RL=8 Ohm) - 0.15%
Connection diagram
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 - 1.0 W
SOI (P=1 W, RL=4 Ohm) - 0.3%
Quiescent current - 14 mA
Connection diagram
TDA1020
Supply voltage - 6...18 V
RL=2 Ohm - 12 W
RL=4 Ohm - 7 W
RL=8 Ohm - 3.5 W
Quiescent current - 30 mA
Connection diagram
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
Connection diagram
TDA1514
Supply voltage - ±10...±30 V
Maximum current consumption - 6.4 A
Output power:
Un =±27.5 V, R=8 Ohm - 40 W
Un =±23 V, R=4 Ohm - 48 W
Quiescent current - 56 mA
Connection diagram
TDA1515
Supply voltage - 6...18 V
Maximum current consumption - 4 A
RL=2 Ohm - 9 W
RL=4 Ohm - 5.5 W
RL=2 Ohm - 12 W
RL4 Ohm - 7 W
Quiescent current - 75 mA
Connection diagram
TDA1516
Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Un =14.4 V, THD = 0.5%):
RL=2 Ohm - 7.5 W
RL=4 Ohm - 5 W
Output power (Un =14.4 V, THD = 10%):
RL=2 Ohm - 11 W
RL=4 Ohm - 6 W
Quiescent current - 30 mA
Connection diagram
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
Connection diagram
TDA1518
Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Un =14.4 V, THD = 0.5%):
RL=2 Ohm - 8.5 W
RL=4 Ohm - 5 W
Output power (Un =14.4 V, THD = 10%):
RL=2 Ohm - 11 W
RL=4 Ohm - 6 W
Quiescent current - 30 mA
Connection diagram
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 - 5 W
Output power (Un =14.4 V, THD = 10%):
RL=2 Ohm - 11 W
RL=4 Ohm - 8.5 W
Quiescent current - 80 mA
Connection diagram
TDA1551
Supply voltage -6...18 V
THD=0.5% - 5 W
THD=10% - 6 W
Quiescent current - 160 mA
Connection diagram
TDA1521
Supply voltage - ±7.5...±21 V
Output power (Un=±12 V, RL=8 Ohm):
THD=0.5% - 6 W
THD=10% - 8 W
Quiescent current - 70 mA
Connection diagram
TDA1552
Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Un =14.4 V, RL = 4 Ohm):
THD=0.5% - 17 W
THD=10% - 22 W
Quiescent current - 160 mA
Connection diagram
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
Connection diagram
TDA1554
Supply voltage - 6...18 V
Maximum current consumption - 4 A
THD=0.5% - 5 W
THD=10% - 6 W
Quiescent current - 160 mA
Connection diagram
TDA2004
Output power (Un=14.4 V, THD=10%):
RL=4 Ohm - 6.5 W
RL=3.2 Ohm - 8.0 W
RL=2 Ohm - 10 W
RL=1.6 Ohm - 11 W
KHI (Un=14.4V, P=4.0 W, RL=4 Ohm) - 0.2%;
Bandwidth (at -3 dB level) - 35...15000 Hz
Quiescent current -<120 мА
Connection diagram
TDA2005
Dual integrated ULF, designed specifically for use in cars and allowing operation with low-impedance loads (up to 1.6 Ohms).
Supply voltage - 8...18 V
Maximum current consumption - 3.5 A
Output power (Up = 14.4 V, THD = 10%):
RL=4 Ohm - 20 W
RL=3.2 Ohm - 22 W
SOI (Up = 14.4 V, P = 15 W, RL = 4 Ohm) - 10%
Bandwidth (level -3 dB) - 40...20000 Hz
Quiescent current -<160 мА
Connection diagram
TDA2006
The pin layout matches the pin layout 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 THD (Ep=±12V):
at P=8 W, RL= 4 Ohm - 0.2%
at P=4 W, RL= 8 Ohm - 0.1%
Bandwidth (at -3 dB level) - 20...100000 Hz
Consumption current:
at P=12 W, RL=4 Ohm - 850 mA
at P=8 W, RL=8 Ohm - 500 mA
Connection diagram
TDA2007
Dual integrated ULF with single-row pin arrangement, 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 Ep=+18 V, RL=4 Ohm - 6 W
at Ep=+22 V, RL=8 Ohm - 8 W
SOI:
at Ep=+18 V P=3 W, RL=4 Ohm - 0.1%
at Ep=+22 V, P=3 W, RL=8 Ohm - 0.05%
Bandwidth (at -3 dB level) - 40...80000 Hz
Connection diagram
TDA2008
Integrated ULF, designed to operate on low-impedance loads, providing 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
SOI (Ep= +18 V):
at P=6 W, RL=4 Ohm - 1%
at P=4 W, RL=8 Ohm - 1%
Maximum current consumption - 3 A
Connection diagram
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 Ep= +24 V, P=3.5 W, RL=8 Ohm - 0.1%
at Ep= +18 V, P=5 W, RL=4 Ohm - 0.2%
at Ep= +18 V, P=2.5 W, RL=8 Ohm - 0.1%
Maximum current consumption - 3.5 A
Connection diagram
TDA2030
Integrated ULF, providing high output current, low harmonic content 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 (at -3 dB level) - 10...140000 Hz
Consumption current:
at P=14 W, RL=4 Ohm - 900 mA
at P=8 W, RL=8 Ohm - 500 mA
Connection diagram
TDA2040
Integrated ULF, providing high output current, low harmonic content 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
THD (Ep=±12V, P=10 W, RL = 4 Ohm) - 0.08%
Maximum current consumption - 4 A
Connection diagram
TDA2050
Integrated ULF, providing high output power, low harmonic content and intermodulation distortion. Designed to work in Hi-Fi stereo systems 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
SOI (Ep=±18V, P=24Wt, RL=4 Ohm) - 0.03...0.5%
Bandwidth (at -3 dB level) - 20...80000 Hz
Maximum current consumption - 5 A
Connection diagram
TDA2051
Integrated ULF, which has a small number of external elements and provides low harmonic content and intermodulation distortion. The output stage operates in class AB, which allows for greater output power.
Output power:
at Ep=±18 V, RL=4 Ohm, THD=10% - 40 W
at Ep=±22 V, RL=8 Ohm, THD=10% - 33 W
Connection diagram
TDA2052
Integrated ULF, the output stage of which operates in class AB. Accepts a wide range of supply voltages and has a high output current. Designed for use 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 passband at the level of -3 dB 100... 15000 Hz and Pout = 0.1... 20 W):
at RL=4 Ohm -<0,7 %
at RL=8 Ohm -<0,5 %
Connection diagram
TDA2611
Integrated ULF designed for use in household equipment.
Supply voltage - 6...35 V
Quiescent current (Ep=18 V) - 25 mA
Maximum current consumption - 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
THD (at Pout=2 W) - 1%
Bandwidth - >15 kHz
Connection diagram
TDA2613
SOI:
(Ep=24 V, RL=8 Ohm, Pout=6 W) - 0.5%
(En=24 V, RL=8 Ohm, Pout=8 W) - 10%
Quiescent current (Ep=24 V) - 35 mA
Connection diagram
TDA2614
Integrated ULF, designed for use in household equipment (television and radio receivers).
Supply voltage - 15...42 V
Maximum current consumption - 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 (level -3 dB) - 30...20000 Hz
Connection diagram
TDA2615
Dual ULF, designed for use in stereo radios or televisions.
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 (at level -3 dB and Pout = 4 W) - 20...20000 Hz
Connection diagram
TDA2822
Dual ULF, designed for use in portable radios and television receivers.
Quiescent current (Ep=6 V) - 12 mA
Output power (THD=10%, RL=4 Ohm):
Ep=9V - 1.7 W
Ep=6V - 0.65 W
Ep=4.5V - 0.32 W
Connection diagram
TDA7052
ULF designed for use in battery-powered wearable audio devices.
Supply voltage - 3...15V
Maximum current consumption - 1.5A
Quiescent current (E p = 6 V) -<8мА
Output power (Ep = 6 V, R L = 8 Ohm, THD = 10%) - 1.2 W
Connection diagram
TDA7053
Dual ULF, designed for use in wearable 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 = 6 V, R L = 8 Ohm) -<16 mA
Output power (E p = 6 V, RL = 8 Ohm, THD = 10%) - 1.2 W
SOI (E p = 9 V, R L = 8 Ohm, Pout = 0.1 W) - 0.2%
Operating frequency range - 20...20000 Hz
Connection diagram
TDA2824
Dual ULF designed for use 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)
Ep=9 V - 1.7 W
Ep=6 V - 0.65 W
Ep=4.5 V - 0.32 W
THD (Ep=9 V, RL=8 Ohm, Pout=0.5 W) - 0.2%
Connection diagram
TDA7231
ULF with a wide range of supply voltages, designed for use in portable radios, cassette recorders, etc.
Supply voltage - 1.8...16 V
Quiescent current (Ep=6 V) - 9 mA
Output power (THD=10%):
En=12B, RL=6 Ohm - 1.8 W
En=9B, RL=4 Ohm - 1.6 W
Ep=6 V, RL=8 Ohm - 0.4 W
Ep=6 V, RL=4 Ohm - 0.7 W
Ep=3 V, RL=4 Ohm - 0.11 W
Ep=3 V, RL=8 Ohm - 0.07 W
THD (Ep=6 V, RL=8 Ohm, Pout=0.2 W) - 0.3%
Connection diagram
TDA7235
ULF with a wide range of supply voltages, designed for operation 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
THD (Ep=12V, RL=8 Ohm, Pout=0.5 W) - 1.0%
Connection diagram
TDA7240
Quiescent current (Ep=14.4 V) - 120 mA
RL=4 Ohm - 20 W
RL=8 Ohm - 12 W
SOI:
(Ep=14.4 V, RL=8 Ohm, Pout=12W) - 0.05%
Connection diagram
TDA7241
Bridged ULF, designed for use in car radios. It has protection against short circuits in the load, as well as 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 - 26 W
RL=4 Ohm - 20 W
RL=8 Ohm - 12 W
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%
Bandwidth level -3 dB (RL=4 Ohm, Pout=15 W) - 30...25000 Hz
Connection diagram
TDA1555Q
Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Up = 14.4 V. RL = 4 Ohm):
- THD=0.5% - 5 W
- THD=10% - 6 W Quiescent current - 160 mA
Connection diagram
TDA1557Q
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, mA 80
Connection diagram
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
Connection diagram
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
Connection diagram
TDA1561
Supply voltage - 6...18 V
Maximum current consumption - 4 A
Output power (Up=14V, RL=4 Ohm):
- THD=0.5% - 18 W
- THD=10% - 23 W
Quiescent current - 150 mA
Connection diagram
TDA1904
Supply voltage - 4...20 V
Maximum current consumption - 2 A
Output power (RL=4 Ohm, THD=10%):
- Up=14 V - 4 W
- Up=12V - 3.1 W
- Up=9 V - 1.8 W
- Up=6 V - 0.7 W
SOI (Up=9 V, P<1,2 Вт, RL=4 Ом) - 0,3 %
Quiescent current - 8...18 mA
Connection diagram
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=9 V (RL=4 Ohm) - 2.5 W
SOI (Up=14 V, P<3,0 Вт, RL=4 Ом) - 0,1 %
Quiescent current -<35 мА
Connection diagram
TDA1910
Supply voltage - 8...30 V
Maximum current consumption - 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
Connection diagram
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
Connection diagram
TDA7056
ULF designed for use in portable radio and television receivers.
Supply voltage - 4.5...16 V Maximum current consumption - 1.5 A
Quiescent current (E p = 12 V, R = 16 Ohm) -<16 мА
Output power (E P = 12 V, R L = 16 Ohm, THD = 10%) - 3.4 W
THD (E P = 12 V, R L = 16 Ohm, Pout = 0.5 W) - 1%
Operating frequency range - 20...20000 Hz
Connection diagram
TDA7245
ULF designed for use in wearable audio devices, but can also be used in any other equipment.Supply voltage - 12...30 V
Maximum current consumption - 3.0 A
Quiescent current (E p = 28 V) -<35 мА
Output power (THD = 1%):
-E p = 14 V, R L = 4 Ohm - 4 W
-E P = 18 V, R L = 8 Ohm - 4 W
Output power (THD = 10%):
-E P = 14 V, R L = 4 Ohm - 5 W
-E P = 18 V, R L = 8 Ohm - 5 W
SOI,%
-E P = 14 V, R L = 4 Ohm, Pout<3,0 - 0,5 Вт
-E P = 18 V, R L = 8 Ohm, Pout<3,5 - 0,5 Вт
-E P = 22 V, RL = 16 Ohm, Pout<3,0 - 0.4 Вт
Bandwidth by level
-ZdB(E =14 V, PL = 4 Ohm, Pout = 1 W) - 50...40000 Hz
TEA0675
Two-channel Dolby B noise suppressor designed for automotive applications. Contains pre-amplifiers, an electronically controlled equalizer, and an electronic pause detection device for the Automatic Music Search (AMS) scanning mode. Structurally, it is carried out in SDIP24 and SO24 housings.Supply voltage, 7.6,..12 V
Current consumption, 26...31 mA
Ratio (signal+noise)/signal, 78...84 dB
Harmonic distortion factor:
at a frequency of 1 kHz, 0.08...0.15%
at a frequency of 10 kHz, 0.15...0.3%
Output impedance, 10 kOhm
Voltage gain, 29...31 dB
TEA0678
Two-channel integrated Dolby B noise suppressor designed for use in car audio equipment. Includes pre-amplifier stages, electronically controlled equalizer, electronic signal source switcher, Automatic Music Search (AMS) system.Available in SDIP32 and SO32 packages.
Current consumption, 28 mA
Preamp gain (at 1 kHz), 31 dB
Harmonic distortion
< 0,15 %
at a frequency of 1 kHz at Uout=6 dB,< 0,3 %
Noise voltage, normalized to the input, in the frequency range 20...20000 Hz at Rist=0, 1.4 µV
TEA0679
Two-channel integrated amplifier with Dolby B noise reduction system, designed for use in various car audio equipment. Includes pre-amplification stages, an electronically controlled equalizer, an electronic signal source switch, and an Automatic Music Search (AMS) system. The main IC adjustments are controlled via the I2C busAvailable in SO32 housing.
Supply voltage, 7.6...12 V
Current consumption, 40 mA
Harmonic distortion
at a frequency of 1 kHz at Uout=0 dB,< 0,15 %
at a frequency of 1 kHz at Uout=10 dB,< 0,3 %
Crosstalk attenuation between channels (Uout=10 dB, at a frequency of 1 kHz), 63 dB
Signal+noise/noise ratio, 84 dB
TDA0677
Dual pre-amplifier-equalizer designed for use in car radios. Includes a preamplifier and a corrector amplifier with an electronic time constant switch. Also contains an electronic input switch.The IC is manufactured in the SOT137A package.
Supply voltage, 7.6.,.12 V
Current consumption, 23...26 mA
Signal+noise/noise ratio, 68...74 dB
Harmonic distortion:
at a frequency of 1 kHz at Uout = 0 dB, 0.04...0.1%
at a frequency of 10 kHz at Uout = 6 dB, 0.08...0.15%
Output impedance, 80... 100 Ohm
Gain:
at a frequency of 400 Hz, 104...110 dB
at a frequency of 10 kHz, 80..86 dB
TEA6360
Two-channel five-band equalizer, controlled via 12C bus, designed for use in car radios, televisions, and music centers.Manufactured in SOT232 and SOT238 packages.
Supply voltage, 7... 13.2 V
Current consumption, 24.5 mA
Input voltage, 2.1 V
Output voltage, 1 V
Reproducible frequency range at level -1dB, 0...20000 Hz
Nonlinear distortion coefficient in the frequency range 20...12500 Hz and output voltage 1.1 V, 0.2...0.5%
Transfer coefficient, 0.5...0 dB
Operating temperature range, -40...+80 C
TDA1074A
Designed for use in stereo amplifiers as a two-channel tone control (low and mid frequencies) and sound. The chip includes two pairs of electronic potentiometers with eight inputs and four separate output amplifiers. Each potentiometric pair is adjusted individually by applying constant voltage to the corresponding terminals.The IC is manufactured in SOT102, SOT102-1 packages.
Maximum supply voltage, 23 V
Current consumption (no load), 14...30 mA
Gain, 0 dB
Harmonic distortion:
at a frequency of 1 kHz at Uout = 30 mV, 0.002%
at a frequency of 1 kHz at Uout = 5 V, 0.015...1%
Output noise voltage in the frequency range 20...20000 Hz, 75 µV
Interchannel isolation in the frequency range 20...20000 Hz, 80 dB
Maximum power dissipation, 800 mW
Operating temperature range, -30...+80°С
TEA5710
A functionally complete IC that performs the functions of an AM and FM receiver. Contains all necessary stages: from high-frequency amplifier to AM/FM detector and low-frequency amplifier. It is characterized by high sensitivity and low current consumption. Used in portable AM/FM receivers, radio timers, radio headphones. The IC is manufactured in the SOT234AG (SOT137A) package.Supply voltage, 2..,12 V
Consumption current:
in AM mode, 5.6...9.9 mA
in FM mode, 7.3...11.2 mA
Sensitivity:
in AM mode, 1.6 mV/m
in FM mode at signal-to-noise ratio 26 dB, 2.0 µV
Harmonic distortion:
in AM mode, 0.8..2.0%
in FM mode, 0.3...0.8%
Low frequency output voltage, 36...70 mV
Many car enthusiasts are tormented by old car radios with poor sound quality, which do not have built-in slots for flash drives and memory cards. As a matter of fact, these are quite old cassette tape recorders and those tape recorders that were released before 2009, which did not have the indicated slots.
Of course, such a problem can be corrected using an FM modulator, but the modulator is not good, it has a lot of shortcomings. Firstly, data transmission is carried out through radio waves, and this is far from analogous to cable transmission.
Once again, a person asked to remake a Chinese radio, which was already inoperative; literally nothing worked on the radio, except for the built-in amplifier, made on the TDA7388 chip. The microcircuit is a good one, supposedly 40 watts per channel, the microcircuit itself is four-channel. Despite the low-voltage power supply, the sound is quite decent, I heard almost no distortion even at maximum power.
Next, it was necessary to start the amplifier, and it has a sleep mode - st-by, in order for the amplifier to exit this mode, it is necessary to connect the 4th leg of the microcircuit to the positive power supply through a 10-15 kOhm resistor. The radio itself already has a built-in filter at the power input, so I didn’t install it additionally.
Next on the radio board you need to find 4 smd capacitors - these are input capacitors. They are quite easy to find, usually standing on the same line, parallel to each other. 4 wires were connected to these capacitors - it is advisable to take shielded ones, since the wires are on the input circuits. Checking the work is quite simple.
We connect the speaker to one of the output wires, then touch the input wires one by one, if there is a characteristic sound (signal) from the speaker, then everything is working as it should, this operation must be carried out with all inputs to make sure that the amplifier is operating normally. I used a Chinese record player with remote control as a signal source.
First you need to check the player itself. As a rule, players of this type already have a complete Class D amplifier for a couple of watts, which is located directly on the player’s board.
I threw out everything from the control panel of the radio, fixed the buttons with hot glue, but they, like the volume control, do not play any role and left them only as decoration.
Next comes the most difficult part - I cut off the built-in display of the player from the main board and brought it to the panel with MGTF wires (0.3 mm), fixing the display with hot glue. Then I used the same wire to connect the USB port and the infrared receiver that were on the player. As a result, about 30 wires go as a cable, from the front panel to the player board.
All contacts and solder joints were carefully fixed with hot glue.
Since the player itself is powered from a reduced voltage, a power supply unit based on a linear voltage stabilizer 7805 was added, so 5 Volts of stabilized voltage goes to the player board.
The current consumption is quite large (up to 650mA), so the stabilizer needs to be screwed to the heat sink; in my case, the stabilizer chip was screwed to the body of the radio; there is heating during operation, but within normal limits.
Next we test the operation of the player, if everything is good, then we move on.
In the third stage, we need to connect the player to the power amplifier of the car radio. This is done quite simply. The player is initially stereophonic and has two independent channels; we will use only one channel, for the reason that the output signal from the player is quite large and a simple divider can be used.
We connect 4 resistors with a nominal value of 1 kOhm to the output of the player, we simply take 4 resistors of the indicated value, connect one of the terminals (all resistors) to each other and at the same time connect the wire from the output of the player to the docking point, connect the free terminals from the resistors one by one to the inputs of the car radio amplifier.
I highly recommend connecting each input of the car radio to ground through a 1kOhm resistor. In my case, there were some problems with the background, or rather there was some kind of high-frequency whistle, so I was forced to use a first-order passive filter, which cuts off all frequencies above 15 kHz, and the background died down.
After successful completion of the alteration, we need to carefully fix all the solder joints with hot-melt adhesive, especially the place where the wires join the input capacitors of the car radio amplifier, since the solder there will not hold up for long, given all the vibrations during driving.
Next are the tests. My player turned out to be quite successful; it has a bunch of functions, including an equalizer. The LED display is pleasing to the eye, bright red in a retro style. To cover the standard area of the former display, I used 3D carbon fiber, it turned out quite stylish, does not catch the eye and looks like an industrial design, the owner was also very pleased.
Make your own amplifier from a car radio
For some reasons, many car enthusiasts are in no hurry to get rid of old car radios that have served their purpose. They are not at all embarrassed by the outdated design of this antediluvian device, nor by the fact that its cassette receiver has not been used for its intended purpose for a long time and the equalizer settings are so primitive that the purity of the sound is regulated only by the volume knob of the car radio itself.
In this case, there are only three reasons for the car owner’s enduring love for his “gramophone”:
- Sentimentality;
- Deafness;
- The price of a new and good car radio is a significant part of the cost of the car itself.
Since purely medical workers are competent in the first two reasons, I propose to consider the third option, which contains real instructions on how to make a sound amplifier with your own hands from a car radio that you were about to throw away.
Car radio resuscitation - Method one
So, in order to make an amplifier out of a car radio, we need to ask ourselves the last two control questions:
- Am I satisfied (if I have a conscience and want to ask my passengers) with the output power and “cavity” of the radio?
- Is the sensitivity of the FM tuner sufficient?
If in both cases you put “pluses”, then you can be congratulated, you have just appreciated the internal contents of this music box, namely:
- Digital tuner;
- Sound control unit;
- Stereo - Quad amplifier.
Well, now let's get to the fun part - how to make an amplifier from a car radio?
In solving this dilemma, thanks to modern technologies and technical characteristics of the old, but necessary, head unit, we will significantly facilitate our task by connecting a digital sound source to the old radio. Well, here we have several options to choose from.
If your radio is really old, then this means that it does not have such currently needed outputs as AUX-IN and a USB port. For this we can use the Car Cassette Tape Adapter Transmitter for MP3.
As you can see in the photo, this adapter is made technically and visually as an analogue of a regular cassette - 100.5 * 63.8-12.0 millimeters. I agree, when you saw this device for the first time, at least you had a slight feeling of surprise and a smile, but wait and judge, you will now understand all the charm and genius of this device.
The principle of turning on this adapter is that you insert it like a regular cassette into the “deck” of a car radio, its head is in contact with the head of the player and by connecting a sound source (player, TV - smartphone, laptop, etc.) via a mini-jack, we We get pretty good sound from the speakers, at least better than some FM transmitters.
In general, everyone is happy - we saved a decent amount on purchasing a car radio (see), the tape recorder thinks it is playing a real cassette)))
Advantages
This:
- The idea itself;
- Price;
- Not bad sound;
- It does not pretend to be a cigarette lighter socket, which, you see, is very important!
Flaws
- Unreliable layout (if you do not use a hammer and screwdriver and do not pull on the cable, it will last a long time);
- Another protruding cable!!!
- When playing, you can hear the sound of a running tape mechanism (this can be eliminated either by turning up the volume or turning off the mechanism itself).
Method two
If the cassette tray in your car radio is faulty or missing (do such things really exist?), the FM transmitter mentioned above may well become an alternative sound source.
For its full operation, you will need to insert a flash drive with music files through the USB port or connect another sound source via AUX-IN, then make room for it in the cigarette lighter and tune your car radio to the same frequency as the FM transmitter.
Advantages
- Easy to connect and use;
- Extensive possibilities for connecting various sources with music files.
Flaws
- Constantly occupied standard port for powering the cigarette lighter;
- If the performance is poor, there is extraneous noise and periodic “glitches”.
Method three
In this method, I would also like to talk about one option, how to make an amplifier from a car radio for more modern devices, such as smartphones, tablets, laptops and the like with Bluetooth adapters.
In this case, the WirelessBluetoothMusicReceiver adapter will help us out, as long as your head unit has an AUX-IN port. Otherwise, you can always use other adapters, adapters and FM modulators capable of simulating additional stereo audio inputs of an audio power amplifier.
Well, if you consider yourself to be one of the normal guys who are not afraid of difficulties and always take a detour, then I can offer you an option not for the lazy in the following method.
Method four
If you are reading this option on how to make an amplifier from a car radio, then by default I assume that you are at least capable of:
- Hold on to the soldering iron;
- Look at the circuit chip;
- See familiar letters in the documentation accompanying the car radio.
Attention!
At a minimum, you need to realize that all actions occur at your own peril and risk, and also that you should have an idea of at least the basics of electronics theory. Any “tuning” of the insides of a car radio must be done by you in a sober mind and in good memory)))
- We remove the “old lady” from its standard location and disconnect all connectors and wires:
Advice! All subsequent actions are not for “fussing around on your knees”; you need to settle down in normal conditions.
- By dismantling the top cover, we can observe the cassette unit. We are making the very first modernization - we remove interference and noise of electromagnetic origin created by the electric motor of the tape drive, for which we unsolder the positive wire and insulate it.
There’s no point in tearing it out, in case someone wants to return everything back?
We determine the place where we will solder the AUX-IN output:
- Firstly. We inspect the wires coming from the pickup head; as a rule, they are soldered to the pre-amplifier circuit; you should not solder here;
- Secondly. We find out where the amplified signal comes from pre-amplification, and it goes to the camparator (the microcircuit responsible for switching between the cassette unit and the FM tuner);
- Third. Either by turning on the logic or using the Datasheet (technical documentation) of the preamplifier chip, we find the output of the audio tracks from it. In the case in the photo, these turned out to be heels numbered FPM 1558 and FPM.
Having traced these tracks that connect the output of the pre-amplifier with the comparator signal, we find out where the left and right audio channels are located - by touching the heels of one of the channels with a screwdriver, while an empty audio cassette is turned on, a characteristic crackling sound will be heard in the speakers. Solder the audio cable outputs from AUX-IN to the left (InLeft) and right (InRight) channels. The third pin (InGND) is soldered to the ground (body) of the car radio.
Unfortunately, this instruction cannot contain all the options for soldering the AUX-IN output to the circuits of all kinds of car radios, but I hope you still understand the principle. Moreover, the Internet is full of various videos on this topic.
I propose to stop here, since this topic can go on and on. As they say, there is no limit to perfection, there is only the limit of the imagination of an individual.
2017-10-23 14:30:35 0 6586
Review of built-in amplifiers in car radios. Which chips sound better?
Sound quality is one of the most important components when choosing a car radio. In most different radios, the parameters and characteristics are very similar, but the difference in price is very significant. Why? GPS is in everyone, Bluetooth, television and so on are also present. In terms of functionality, all modern car radios are very similar, which makes it difficult for consumers to choose. So, the sound quality of your radio, as well as the price, is directly affected by the type of Low Frequency Amplifier (LF Amplifier) chip. These microcircuits can be very different in characteristics and quality, which affects the cost of the car radio.
In this article we will help you understand these chips. Of course, the sound quality is also influenced by the car’s acoustics, external amplifier (if available), wiring, etc. But the basis of high-quality sound is the ULF chip! If you use a cheap ULF chip, then no matter how you distort it, no matter how sophisticated the acoustics you install, you will not get good and high-quality sound. Based on this, when buying a radio, you should inquire about the type of microcircuit and you are guaranteed high-quality sound.
But there is one caveat. Most car radio sellers do not know which ULF chip is installed in each specific radio. Also, this information is not indicated on the manufacturer’s website. You will be able to find out the output power, in most cases overestimated, and possibly the frequency range that is reproduced - that’s all the information on the sound. In most cases, the manufacturer hides information about the chip used, because... A cheap chip is installed to reduce the cost of the device.
On the Android operating system they are already not cheap, but what if you also install expensive Low Frequency Amplifier microcircuits on them? So the manufacturer installs a budget microcircuit so as not to scare off the client with the price. Since the sound power completely depends on the installed chip, we can conclude that the greater the power, the higher the quality of the ULF installed in the head unit.
To make the right choice, let's move on to a description of the types of microcircuits that developers use in car radios:
1. Chip TDA 7388
This is the simplest and cheapest microcircuit that is installed in most cheap car radios.
Characteristics:
- 4 channels of 40 W maximum into 4 ohm load
- operating frequency from 20 Hz to 20 kHz (The entire frequency range audible to the human ear)
- THD 4 x 25W 4Ohm (14.4V, 1KHz) -10%.
The sound quality leaves much to be desired; there is no softness at low frequencies, and there is no purity of sound at high frequencies. The sound is satisfactory, so-so. Also, a radio with this microcircuit cannot be connected to premium acoustics, the resistance of which at the input is 2 ohms.
2. TDA 7850 MOSFET chip
A very good amplifier with high-quality sound, to which you can connect any acoustics.
Characteristics:
- 4 channels of 50W/4Ohm MAX.
- 4 channels of 80W/2Ohm MAX.
Excellent sound quality at any frequency. There is no high-frequency interference and the level of extraneous noise is low.
3. TDA 7560 MOSFET chip
An analogue of the TDA 7850 chip described above, but much cheaper. Since it was developed specifically for use in car radios.
Characteristics:
- 4 channels of 50W/4Ohm MAX.
- 4 channels of 30W/4Ohm 14.4V, 1KHz, 10%
- 4 channels of 80W/2Ohm MAX.
- 4 channels of 55W/2Ohm 14.4V, 1KHz, 10%
- Manufactured using MOSFET technology
- Excellent matching with 2 ohm speakers
- Hi-Fi class in terms of signal-to-noise ratio
The sound is pretty good, but when compared with the 7850, the sound picture is a little less rich.
4. TDA 7851A MOSFET chip
This chip is a continuation of the TDA 7850 and is designed specifically for car head units. The performance is superior to its predecessor, although the power is slightly reduced to reduce heat generation.
Characteristics:
- 4 channels of 45W/4Ohm MAX.
- 4 channels of 28W/4Ohm 14.4V, 1KHz, 10%
- 4 channels of 72W/2Ohm MAX.
- manufactured using MOSFET technology
- Excellent matching with 2 ohm speakers
- Hi-Fi class in terms of signal-to-noise ratio
The owner of a radio with this chip will get the ideal sound for true music lovers without distortion or loss. This microcircuit is also characterized by a low level of sound distortion with minimal losses and has the highest sound class - AB. There is input voltage control and various types of protection.
Conclusion:
If you are a true connoisseur of sound quality and want to surprise your passengers with bright, rich, high-quality sound, look for a car radio with a TDA 7851A MOSFET chip.
