The class AB amplifier is intended for use as a power amplifier in household appliances. The TDA2030 microcircuit has thermal protection and protection against short circuit of the output to the case. The gain in amplifiers with feedback should not be less than 24 dB.

Fig. 1. Pinout of the TDA2030 microcircuit

Fig. 2. Switching circuit of the TDA2030 microcircuit with bipolar power supply

Fig. 3. Amplifier circuit board on TDA2030 with bipolar power supply

Fig. 4. Connection diagram of the TDA2030 microcircuit with unipolar power supply

Fig. 5. Amplifier circuit board on TDA2030 with unipolar power supply

The gain in amplifiers with feedback should not be less than 24 dB. The recommended values of the attachments are given in the table, but other values can be used. The table is intended to guide the developers of auto equipment.

Designation	Recommended value	Appointment	More recommended	Less than recommended
C1	1 uF	DC input isolation	-	Raising the lower cutoff frequency
C2	22 uF	DC decoupling inverting input	-	Raising the lower cutoff frequency
C3, C4	0.1 uF	Power decoupling	-	Danger of generation
C5, C6	100 uF	Power decoupling	-	Danger of generation
C7	0.22 uF	Frequency stabilization	-	Danger of generation
C8	1 / (2π * F * R1)	Upper cutoff frequency	Reducing bandwidth	Increased bandwidth
R1	22 k Ohm	Gain	Increase gain	Reducing gain
R2	680 Ohm	Gain	Reducing gain	Increase gain
R3	22 k Ohm	Offset non-inverting input	Increasing the input impedance	Reducing input impedance
R4	1 ohm	Frequency stabilization	Danger of Generation at High Frequencies with Inductive Load
R5	3 * R2	Upper cutoff frequency	Poor high frequency attenuation	Danger of generation

The protective circuits of the TDA2030 microcircuit limit the output currents of the output transistors in such a way that their operating modes do not go beyond the safe operation zone. This function can be classified as a peak limiter rather than a current limiter. Thanks to it, the likelihood of damage to the device as a result of an accidental short circuit of the amplifier output to the case is significantly reduced.

With regard to thermal protection, when the temperature of the crystal rises above 150 ° C, the thermal protection system limits the current consumption and power dissipation. Therefore, even a constant output overload or too high air temperature will not damage the TDA2030 microcircuit. The radiator can be made without a safety margin in case of overheating, as is done in the classical version of the thermal calculation.

No insulation is required between the TDA2030 chip and the heatsink. The use of a heat-conducting paste is recommended.

The printed circuit boards and switching circuits for the TDA2030 microcircuit fully comply with TDA2006.

The TDA2030A is a microcircuit designed to perform the functions of an analog single-channel amplifier for Hi-Fi systems with a power up to 18 W (or a driver up to 35 W). Provides a signal-to-noise ratio of 106 dB. Equipped with built-in thermal protection (triggered when heated above 145 ° C). Amplifier class - AB (compromise).

The pinout of the microcircuit is as follows.

Analogs differing in the maximum supply voltage:

TDA2040,
TDA2050
Etc.

There are other types of microcircuit, besides the TDA2030A:

TDA2030AL (it differs in the case and therefore may not fit the finished printed circuit board);
TDA2030 (standard, basic version, differs from modification "-A" in lower supply voltage);
TDA2030AV (designed for vertical mounting);
TDA2030AH (mounted parallel to the board).

Bass amplifier

The amplifier circuit is practically no different from the microcircuit recommended for inclusion in the datasheet.

And below is a working diagram.

Table. The technical characteristics of this LF amplifier are as follows.

Supply voltage
Peak output current
Quiescent current
Long-term out. power
At KG 0.5%, U pit = 32V, R load. = 4ohm
With a THD of 0.5%, U pit = 32V, R load. = 8 Ohm
With a THD of 0.5%, U pit = 38V, R load. = 8 Ohm
Amplification factor for ex.
Input impedance
Play range frequencies
The total value of the coeff. nonlinear distortion

The following elements are used in the scheme:

Capacitors

C1 - 0.47 μF (1 pc);

C2 - 2.2 μF, rated for 50 V;

C3 - 22 μF, 50 V;

C4 - 1000 μF, 50 V;

C5 - 0.1 μF, 50 V;

C6 - 2200 uF, 50V;

C7 - 0.1 μF, 50 V;

Chip

DA - this is the TDA2030A;

Resistance

R1, R2, R4, R5 - 100 kΩ resistors;

R3 - 4.7 kOhm;

VD1,2 - diodes 1N4001;

Terminal clamps.

The printed circuit board will be made on a single-layer PCB and will look like this.

The size of the PCB is only 53x33 mm.

When assembled, the product looks like this.

The second version of the amplifier on the TDA2030A

So, the circuit itself.

PCB option (also single-sided).

All necessary elements are listed on the schematic diagram.

With so many nodes, some craftsmen make this amplifier without printed circuit boards (connection by soldering).

It turns out, for example, like this.

The microcircuit is attached to the radiator from the inside of the lid (the radiator is blown from the outside).

The supply voltage for this option is 4.5 ... 25 V.

The frequency range is 20 ... 80,000 Hz.

Max. power - 18 W.

A Few Tips

If there is no time and opportunity to make a printed circuit board, you can scratch grooves on a one-sided PCB so that the resulting areas correspond to the tracks on the diagram. But here you should be extremely careful to avoid a short circuit.

The above circuits work with only one channel of sound, so if you need a stereo effect, then the number of parts and boards is multiplied by two (two identical bass amplifiers are made).

Since the body of the chip is actually connected to the negative terminal, you should not place two different TDA2030A microcircuits on the same heat sink (or, alternatively, you will need to use a heat-conducting dielectric).

To improve thermal conductivity, apply thermal grease to the place where the heatsink touches the chip body.

Date of publication: 01.12.2017

Readers' opinions

yuri / 07/21/2018 - 23:59
"And below is a working diagram." (unipolar) r5 / r3 ratio must be no less than the r1 / r2 recommended in the datasheet and it is less. c1 should also be like a 1mkf datasheet, otherwise you will cut off the low frequencies. Educate yourself: https://www.youtube.com/watch?v=6DpjYgfU1R8

An amplifier on an integrated circuit TDA2030, as well as analogs of this microcircuit A2030H, B165, ECG1376, ECG1378, ECG1380, TDA2006, TDA2030A, TDA2030, TDA2040, TDA2051. It allows you to get the sound of amplifiers in the price category up to $ 100-150 without much investment. You can read more about the capabilities of the TDA2030 chip in this article:.

Main characteristics of the amplifier:
Supply voltage ................................ from ± 4.5 to ± 25 V
Current consumption (Vin = 0) ...................... 90 mA max.
Output power .................................. 18 W typ. at ± 18 V, 4 ohms and d = 10%
.................................................. .................. 14 W typ. at ± 18 V, 4 ohms and d = 0.5%
Nominal frequency range .......... 20 - 80.000 Hz

Amplifier circuit diagram:

Bridge circuit:

The printed circuit board has been designed for stereo / mono connection, which allows it to be used for both satellites and a subwoofer channel without any problems. Reproduces low frequencies very well.

Required parts (per board):
- two ceramic capacitors 4.7 μF each (preferably K73-17)
- six ceramic capacitors, 0.1 μF each
- four electrolytic capacitors 2200mkF each
- two electrolytic capacitors 22μF each
- five 22kOhm resistors
- two resistors of 680 Ohm
- two resistors of 2.2 Ohm, 5W power
- two microcircuits

The total cost of such an amplifier is approximately 200 rubles.

List of radioelements

Designation	Type of	Denomination	Quantity	Note	My notebook
DA1	Audio amplifier	TDA2030	1		Into notepad
C1	Capacitor	4.7 uF	1		Into notepad
C2		22 uF	1		Into notepad
C3, C4, C7	Capacitor	0.1 uF	3		Into notepad
C5, C6	Electrolytic capacitor	2200 uF	2		Into notepad
R1, R3	Resistor	22 k Ohm	2		Into notepad
R2	Resistor	680 Ohm	1		Into notepad
R4	Resistor	2.2 ohm	1	5 Watt

In the review, we study the ULF class AB (2 + 1) radio designer on TDA2030 microcircuits.
Diagram, description of the designer, replacement of microcircuits with TDA2050 / LM1875, measurements, possible upgrade.

ULF characteristics
1. Class AB
2. Supply voltage double 12V АС 30W. It is better to use a 40W or more transformer.
3. Maximum output power 15 watts per channel
4. Load resistance 4 to 8 Ω
5. Microcircuits are protected from overheating, short circuit.
6. Possibility to connect a passive subwoofer.
7. THD 0.1% or less.

Package

Constructor:

Double-sided PCB (quality):

Detail detail

Capacitors:

Potentiometers (all 50 kΩ, linear):

Fittings:

TDA2030, op amp NE5532, 12V stabilizers.

Radiator for one TDA2030. It is soldered into the board with two legs:

We consider the area: (3 * 3 + 1.5 * 3 * 2 + 0.7 * 3 * 6) * 2 = 61.2 cm ^ 2
Power transformer (mine) 40 watts, two windings of 12 V alternating:

ULF circuit

I restored the scheme on the seal. Perhaps I was wrong somewhere. If someone notices a mistake - write, I will correct it.

According to the TDA2030 datasheet, it is recommended to put two capacitors (an electrolyte of 100 μF and a shunt of a 0.1 μF ceramic film) and two diodes to power each microcircuit:

They are not here.
Two TDA2030 are on the right-left channels, two are included in the bridge and are used for the subwoofer. One preamplifier on the NE5532 works for the common input, the second for the subwoofer.
At the input of the amplifier there are two electrolytes of 4.7 uF, the same is not very good. At the input of the channels, there is 0.1 μF ceramics. Not good either.
The volume control is afterwards. You can burn the opamp with a strong signal.

I will write right away that I replaced all Chang electrolytic capacitors with Jamicon 50 V. I put two condenders on the power filter at 4700 uF * 50 V (maximum in capacity, which climbed onto the board). I planned to test the amp on a 22-25 V supply, but because of the small radiators, I abandoned this idea. In another radiator, it was too lazy to drill 4 holes and re-solder the capacitors too.

Before completely unsoldering the amplifier, I decided to assemble only a diode bridge for power supply, power filters and two channels - right and left. I decided not to solder the preamplifiers and the amplifier for the subwoofer. I did some experiments.

Results of experiments with different capacitors and microcircuits TDA2030 / TDA2050 / LM1875

It was connected through the AC protection board, just in case, Mission M51 8 Ohm AC, DAC Constantine + DAC source (Philips TDA 1545A + Analog Devices 826 opamp) via USB.

First test. Ceramic VS film
First, I installed two TDA2030 microcircuits from the set. On one channel I installed 0.1 uF ceramic capacitors, on the second one Wima MKP-4 0.1 uF 250 V. Wima capacitors were placed on the seal without any problems:

I turned on the power, listened - the result is obvious. With Wima MKP-4 0.1 uF it plays much better. The sound is more detailed. With ceramics, it "sands" a little. If at the input of the ULF, instead of 0.1 μF, a film is installed at 2 μF, then the sound improves - the bass plays better.
The sound of the TDA2030 chips is quite harsh. HF (cymbals, for example) plays. with bass, too, ok by ear (especially if you put a 2 uF film at the input).
For further experiments, I removed the ceramics, put Wima MKP-4 0.1 μF everywhere.

Next, we will test the ULF with different microcircuits. The supply voltage remained the same - 12V double change.
Patients:

From right to left: TDA2030 from the set, TDA2030 offline purchased (leftist apparently), TDA2050 offline purchased, LM1875 offline purchased. All microcircuits are interchangeable. The max. supply voltage, power and distortion level.
Close-up:
TDA2030 from the set:

TDA2030 offline:

TDA2050 offline:

LM1875 offline:

All tests with a 12V transformer.

Second test. TDA2030 from VS TDA2030 offline kit
The sound of the Chinese microcircuits from the set turned out to be better than those purchased offline. On offline, the sound is blurry. We liked the Chinese TDA2030 from the set more.

Third test. TDA2030 from VS TDA2050 offline kit
The TDA2050 is a more powerful microcircuit. If you raise the supply voltage to 22V, it can deliver up to 20W into an 8 ohm load at a THD of 0.03% at 1kHz.
Installed. I listened. With this, the TDA2050 plays worse. The sound is somehow "smeared", sluggish and a little muffled. Strange, the people on the forums and reviews of the TDA2050 like it better for some reason.

Fourth test. TDA2030 from VS LM1875 offline kit
LM1875 is a more powerful microcircuit. If you raise the supply voltage to 25V it can deliver up to 20W into an 8 ohm load at a THD of 0.015% at 1kHz.
Installed. I listened. The LM1875 has a more detailed sound, a little softer than the TDA2030, but also quite harsh, not sluggish.

Bottom line - LM1875 won in my tests.
There is a well-known review on YouTube on the tests of the TDA2030, TDA2050, LM1875 microcircuits:
TDA2050 won there. The choice is yours.

Assembled by the constructor. All microcircuits, ceramic capacitors from the set. Electrolytes, as I wrote above, replaced. I installed the opamp on the panels (they were not in the set, I put my own ones). Washed the board. Here's what happened:

Controls from right to left: volume control, tone control, subwoofer level. Two resistors are normal (no crackling, no sound at the min position, channel imbalance, etc.). One (tone control) - crackles a little when rotated. The usual lottery for such cheap parts.
The tone control works on the frequency response like this:

Let's carry out standard voltage measurements in the ULF.

Voltage measurements

AC voltage across power transformer
One winding:

Another:

After diode bridge no load
One polarity:

Other polarity:

Load (amp in clipping)

After stabilizers on the op-amp

Connect the load (2 resistors 8 Ohm at 100 W for each channel and 6 Ohm 100 W for the subwoofer) and measure the constant at the ULF output at the minimum position of the volume control:
Right channel:

Left channel:

Subwoofer:

Let's measure whether the ULF is working (let's apply a 1 kHz signal to the input and look at the output signal with an oscilloscope) and calculate the power of the main channels (load 8 Ohm). Two thermometers - one for the channels, the second for the amplifier for the subwoofer:

At the entrance:

At the exit:

A little more and we get clipping:

Pmax = (23.6 / 2) * (23.6 / 2) / 8 = 17.4 watts
Prms = 8.7 Watt
Rectangle (turn the tone control all the way to the right - otherwise it turns out to be a curve)

Everything is ok and here.
The amplifier for the subwoofer works like this:
At the entrance like this:

The output is like this:

If we increase the signal amplitude on the subwoofer with the leftmost resistor, we get this:

If it is even more, then it turns out like this:

With an increase in frequency (for example, up to 400 Hz), we get this:

The subwoofer was blown away ...

At a temperature of about 110 degrees on my sensors, thermal protection is triggered and the microcircuits are turned off. Small radiators and no airflow.

I also noticed that the built-in preamp on the op-amp amplifies the sound by only 20%.

Right and left channel tests using RMAA software

It was tested on a load of 8 ohms, the maximum output power is about 10 watts; at higher power, distortions appear.
Key control to maximum:

I connected the amplifier to the speakers of the Mission M51 8 Ohm speakers, the DAC Constantine + DAC source (Philips TDA 1545A + Analog Devices 826 opamp) via USB. I connected an old speaker as a subwoofer.
I listened to it on different tracks. The amplifier in the near-stock version works well. That is to say, "very balanced." There are not enough stars, but it wins back its price perfectly. A little bit really "sandy" and gives a hard sound. Apparently due to ceramic capacitors. Better than inexpensive D-class (e.g. PAM chips)

Here on the site there is an overview of a similar (apparently identical in the scheme, but with different details and color of the board) amp -. The author has designed it in the corpus.

What we have as a result.
It plays for its money even with a basic set of parts quite well. The constructor can be used if you have a couple of speakers and a subwoofer (for example, from a home theater, car acoustics, computer acoustics, etc.). There he belongs. If only stereo, then they sell a bunch of sets in different versions on these ULF microcircuits only for stereo. If the acoustics are cheap, then
there is no sense of the upgrade in terms of details. If it is more expensive, then we change all 0.1 uF capacitors to a decent film, strengthen the battery in the power supply, change all the through conductors to 2 uF film, change the microcircuits (ULF and OA) and regulators, to increase the power, raise the supply voltage and put a new radiator etc. however, after the upgrade, the ULF will cost more than $ 10.

Thank you for the attention.

The product is provided for writing a review by the store. The review is published in accordance with clause 18 of the Site Rules.

I plan to buy +42 Add to favourites I liked the review +40 +74 Audio engineering

Sound amplifier chip TDA2030A

The TDA2030A is an integrated circuit that implements the functionality of a class AB low frequency amplifier (the best option for an amplifier based on push-pull transistor stages). It can also be used to assemble signal repeaters, current sources or power supplies, as well as other devices.

The microcircuit has many full or partial analogs:

ECG1376 (1378/1380);
B165;
A2030H;
TDA2006 (as well as 2040, 2051, 2030).

The original ST Microelectronics model has built-in overload, overheating (triggered at temperatures above 145 ° C) and short-circuit protection.

Power supply can be unipolar or bipolar. Of course, in the latter case, the amplification quality is better.

Simple ULF on TDA2030A

By simple we mean "single-channel", because its implementation requires a minimum of parts and connections, also only one power supply.

Installation, if desired, can be carried out even without a breadboard ("by weight").

So, sema ULF.

Rice. 1. Sema ULF

All ratings of radio components are indicated directly on the diagram. The installation of the microcircuit must be performed on the radiator without fail.

Optionally, you can use the following PCB option (although it could be implemented differently, or a breadboard could be used).

Rice. 2. Printed circuit board

The TDA2030 is specially placed on the edge of the board for mounting on a radiator (so that it does not interfere with other parts, regardless of size).

Such an amplifier must be powered by a separate voltage source. It can be assembled according to the simplest scheme below (based on a diode bridge and a capacitor filter).

Rice. 3. Amplifier circuit

Any secondary transformer is suitable, the main condition is a voltage of 20-22V (you can even connect several windings in series, for example, 10 V each).

The supply voltage of the amplifier indicated above can be in the range of 12-36 V.

Bipolar powered

As mentioned above, the bipolar power supply significantly improves the amplification quality of the TDA2030A.

The circuit can also be called "simple", if not for the presence of two independent power supplies.

So, the schematic itself.

Rice. 4. Schematic diagram

If you need to power high-power speakers (up to 32W), a bridge circuit can be used. It looks like this.

Rice. 5. Bridge scheme

Here, too, two independent power supplies are required.

Three-way ULF

If you want to separately amplify different signal frequencies, then you need the circuit below.

It already has built-in frequency dividers (the ranges are indicated on the inputs to the branches of the circuit).

Rice. 6. Scheme of three-band ULF

Notes (edit)

The maximum output power of the TDA2030A is 18 W. In all the above schemes, the microcircuit is mounted on naturally cooled radiators (it is desirable to use thermal paste to improve heat dissipation).

The supply voltage of the microcircuit should not be higher than 22 V.

Date of publication: 01.03.2018

Readers' opinions

Sergey / 04/26/2018 - 15:13
Soldered works fine. To improve the sound (under the room), it is possible to experimentally change the frequencies, all three.