Active speaker system based on TDA2005 IC. Active speaker system based on TDA2005 IC Technical characteristics of the TDA2005 amplifier

Satisfied after assembly, the decision came to build a stereo amplifier on the same chip.

Let’s immediately list the characteristics that the manufacturer claims:

• Supply voltage (V)……………………………………………………6-18
• Peak output current (A)……………………………3
• Quiescent current (mA)…………………………………………..75
• Reproducible frequency range (Hz)………………..40-20000
• Harmonic distortion factor (%)……………………….1
• Nominal load resistance (Ohm)…………………..3.2
• Minimum load resistance (Ohm)…………………….2
• Output power (W at 18 V supply voltage)……..22
• Input sensitivity (mV)………………………………….300
• Gain (dB)……………………………………………………….50

TDA 2005 amplifier with good characteristics.

In addition, you need to take into account its useful qualities:

• load short circuit protection;
• overheat protection;
• protection against power surges in the range up to 40 V;
• the amplifier has a wide range of supply voltages from 6 to 18 V.

The printed circuit board from 2005 was made in lay. Built taking into account the use of convenient terminal blocks.

One of the methods to reduce interference would be to connect the microcircuit housing to the minus of the general power supply.

• It is advisable to purchase capacitors for 25 Volts;
• resistors, the best option is 0.25 watts;
• Be sure to purchase input wires with shielding, this will protect you from additional interference and extraneous sounds

This scheme car amplifier on TDA2005 has a number of advantages:

• speed of production;
• obtaining quite decent equipment;
• low cost of production.

At the output we get an amplifier measuring 70mm x 41mm:

Sound quality is acceptable. Pop and metal are played well. The bass doesn't mix into mush.

Now let's move on to the most interesting part, testing.

I’ll note right away that the circuit and printed circuit board on which the amplifier is assembled were taken from the Internet and are positioned as the most popular. Let's get started.

The amplifier was tested on Soviet speakers with an impedance of 4 Ohms. Transformer power supply 18 volts.

In terms of power supply: the amplifier starts working at 3 volts, although not very well, it choke at low frequencies. Already at a voltage of 19 volts the protection is triggered. Optimal power supply is 14 volts 3 amps.

The microcircuit gets very hot, so make sure you have a good heatsink, and it’s a good idea to use thermal paste.

Amplifier output impedance: oddly enough, but the readings are 0 Ohm.

The frequency response surprised me, it’s quite straightforward

Now let's connect it to the generator and see what happens.

1. The manufacturer promises a range of 40Hz-20kHz

I decided to run a sine wave at 10 Hz and the amplifier coped with it, albeit with distortion

Copes with a frequency of 100Hz without problems

At 1 kHz the booknife decreased noticeably

Well, at 10 kHz something terrible and incomprehensible is happening

As you can see, high frequencies are not his thing; the amplifier cannot cope with them. At 20 kHz the sinusoid ceases to be a sinusoid at all.

Now let’s send a 1 kHz square wave signal to the test subject.

On the graph we see a strong ringing, excitation at the peaks of the HF signal.

What we have in the end is ULF for 2005.

The amplifier itself is not bad. Low cost, simple element base, easy repeatability makes this amplifier “folk”. You can’t blame him, since he didn’t claim a place among Hi-Fi amplifiers.

In addition, its simplicity allows it to be used for any application. Even in a simple computer speaker, or even built into a scooter or boat.

All the best!

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The amplifier on the TDA2005 chip is a stereophonic ULF with an output power of 10-12 watts per channel, there is also a mono option, in which case the amplifier output power is 20-25 watts. The ULF is powered by 12 volts, so this option is optimal for car amplifier low power. I would like to say right away to remind you that winter is just around the corner and I would like to recommend Yokohama iceGUARD tires. Find out all the advantages, come in and order shinaland.com.ua/tyres/yokohama/iceguard-stud-ig35

This amplifier circuit has a number of advantages:

1. Quick assembly
2. Components are cheap
3. High-quality and clear sound

The amplifier operates in class AB and 30% of the coefficient useful action The microcircuit is heated, so additional cooling is required. You can attach the microcircuit to the radiator using special gaskets and washers. Since the TDA2005 gets quite hot, choose a radiator large sizes.

Technical characteristics of ULF on TDA2005

• Supply voltage (B)……………………………………………6-18
• Peak output current (A)…………………………….3
• Quiescent current (mA)………………………………………………………………………………………75
• Frequency range (Hz)……………….40-20000
• Total harmonic distortion (%)…………………………1
• Nominal load resistance (Ohm)…………………..3.2
• Minimum load resistance (Ohm)……………………..2
• Output power (W at 18 V supply voltage)….22
• Input sensitivity (mV)…………………………………………300
• Gain (dB)………………………………………………………………..50

To reduce interference, you can connect the microcircuit housing to the power supply minus with a separate wire. Choose capacitors with ratings of 16 - 25 volts. The amplifier's sensitivity to low frequencies. Select resistors of 0.25 watts.

The circuit also has a filter to suppress interference; it is assembled from 2 capacitors, an electrolyte and a choke. Capacitors are used to smooth out low-frequency interference, and a choke is used for high-frequency interference. This filter also suppresses noise from the engine, which is sometimes heard from the speakers.

TDA2005
This design can be made as an independent set of active speaker systems for reproducing a signal from the output of a personal computer, or used as a repair circuit for repairing a purchased active speaker with a faulty AF power amplifier circuit.

The TDA2005 microcircuit belongs to the category of inexpensive and widely available integrated UMZCH. A relatively small number of hanging elements, combined with good electrical characteristics, the presence of output overload protection, thermal protection, as well as the ability to set the transmission coefficient within a wide range (by selecting resistor resistances in the OOS circuit). All this allows you to build a wide variety of amplifiers or active speaker systems based on the TDA2005.
Figure 1 shows a diagram of a simple set of active speakers with the following parameters:

1. Output power at THD = 10%, into a 4 Ohm load...........2 x 8W.
2. Output power at THD = 0.3%, into a 4 Ohm load...........2 x 5 W.
3. Input signal level to obtain an output power of 1 W. . 90 mV.
4. Gain factor taking into account losses in the tone control........36 dB.
5. Possibility of increasing the gain up to.........50 dB.

The circuit is powered from the power supply of an old HP840 printer (output voltage 18V), but the supply voltage can be from 8 to 18V, and the output power changes accordingly.

The stereo input signal goes to connector X1. A passive adjustment block is made on variable resistors R3, R5, R9. Double resistor R3 adjusts the HF tone simultaneously in both channels. Double resistor R5 is used to adjust the volume. Resistor R5 is used with taps from the “horseshoe”, which serve for loudness compensation, which improves the sound when operating at low volumes. Single variable resistor R9 serves as a stereo balance regulator.

The amplifiers included in the TDA2005 are powerful operational amplifiers with single-polar power supply, direct inputs - pins 5 and 1, inverse inputs, respectively, - pins 4 and 2.
By changing the resistance of resistors R13 and R15 (or R12 and R14), you can change the transmission coefficient of the amplification channels over a wide range. For resistances R13 and R15 the dependence is inverse, and for R12 and R14 it is direct.

The R10-C12 circuit is used to smoothly turn on the amplifiers, in order to avoid surge current in speaker systems.
Capacitors C13 and C16 create a voltage boost to the output stage, increasing the output power without increasing the supply voltage. The amplifier can operate without them, in this case C13 and C16 are removed, and pins 7 and 11 are connected to the positive power bus (with pin 9). But in this case the maximum power is lower.
The parts of the adjustment unit are mounted directly on the terminals of variable resistors installed on the front panel of the housing of the main active speaker system in which speaker B2 is located. Since the regulators are passive, it is more convenient in all respects.

The parts of the amplifier itself are mounted on a small printed circuit board, the diagram of which is shown in Figure 2.

The board is made of single-sided foil glass-textile.
Output capacitors C21 and C18, as well as smoothing capacitor C19, are located outside the printed circuit board (rigidly secured with clamps in the main speaker housing).

The printed circuit board does not have its own fastening elements - it is attached to the radiator using the radiator plate of the microcircuit, with one screw. The board together with the radiator is located in the housing of the main active speaker.

Only speaker B1 is located in the body of the second speaker. It is connected to the speaker base using a cable via connector X2.

To remove heat from the microcircuit, a radiator is used, the design of which is shown in Figure 3. The radiator is made of a metal profile for constructing a frame for suspended ceilings or plasterboard panels. For one radiator, you need to cut two pieces 10-15 cm long. Then, one of the pieces needs to be cut lengthwise into two identical parts (you get two corners). Next, two corners are folded “over the roof” and placed in the middle inside a whole piece of profile. All mating surfaces must be coated with heat-conducting paste.

Comments (19):

Thank you very much, but I would suffer again for a long time) very good site! +5

Why might there be a strong background?

#3 root April 01 2011

Maybe due to a bad power filter, try replacing and increasing the capacity of the electrolytic capacitor, which is located after the diode bridge in the rectifier. C5 is used as a power supply filter in the above circuit, try changing it. Also, the background may be due to interference in the input circuits. The wires carrying the signal to the amplifier input must be shielded, and the shield must be connected to the common one (minus).

with C5 everything was fine, I installed a rectifier at the output of 2 4000mk 50V condensers and shielded everything possible, the background was blown away) now another problem is the bass is wheezing, what could it be? Everything is fine with the column.

#5 root April 02 2011

IN in this case There are already more options, here are the ones I came across:

1. It is most likely that the power supply cannot withstand the load; when driving this amplifier, it consumes considerable current. Try connecting the circuit to a more powerful power supply or to battery 12V large capacity.
2. Perhaps at high volumes the signal source itself is distorted (it is faulty or the equalizer is poorly configured), try connecting a player to an amplifier or taking a signal from a computer sound card.
3. You came across a defective microcircuit, try to replace it with one purchased from another store (it often happens that you come across a batch of defective ones).
4. Adjust the feedback circuit further - R1, C1, C2. Instead of R1, we turn on a variable resistor; it is advisable to check C1, C2. We supply power and signal to the amplifier, achieving normal gain without distortion or overload.

#6 Alexander December 24 2014

What's the problem people? I assembled the amplifier according to the second circuit, after turning it on, after about 5 minutes the electrolyte capacitor C5 heats up, and noise and hissing begin, maybe the reason for this is in the resistors R2, R3 I set to 0.8 ohms, or in the ceramics C4, C6,..C9?

#7 root December 24 2014

The publication was updated and put in order; the old information and diagram from Bashirov’s brochure were removed because the diagram and printed circuit board there did not match and there were other errors.

Alexander, it’s very strange that capacitor C5 is heating up, from what source are you powering the circuit? - need to be fed straight constant voltage- step-down transformer + diode bridge, we get a constant voltage at the output.

#8 Alexander December 24 2014

In general, I found and fixed the error, it turns out I mixed up the polarity of the capacitor, I am powered by a Soviet power supply unit 6-9 volts 0.1 ampere, constant. I am very grateful to the site for the diagram and help in setting up. For updating the site 5+

#9 Nazar February 24 2015

Why does the finished amplifier play quietly?

#10 root February 24 2015

• Check for shorts between tracks and other debris on the printed circuit board;
• The signal level at the amplifier input is low; for the experiment, apply a signal to the amplifier from another source;
• Weak power supply, there is not enough current to drive the ULF, try powering it from a battery or powerful block nutrition;
• One or more electrolytic capacitors are faulty - check the charge/discharge tester and try to replace them;
• Resistor R1 is soldered to a different value;
• The microcircuit is scorched, check whether it gets too hot in idle mode, try replacing the microcircuit.

#11 Evgeniy March 16 2015

A good amplifier put together such a mono. I'm pleased with the gain factor, the S90 rocks. Collected according to the production seal. Can be downloaded from lay at http://ampexpert.ru/usilitel-20-vt-na-tda2005-mono/

#12 Alexander March 27 2015

good afternoon. I have such a situation, the amplifier perceives interference from the signal source, from the DVD player there is a whistling sound from the computer, from the phone small whistling sounds are barely perceptible but are there. I sinned on the power supply connected to computer unit and the same thing, then I wandered around on different sites and discovered that there are circuits where a high-frequency transistor SS9014 is placed at the input of the microcircuit, I think you just need to raise the frequency at the input a little so that it does not coincide with the network, but I don’t know how much this will help, since the sound goes from 20 to 20,000 Hz, which means raising the frequency to at least 100 Hz, allowing it to be connected to the network raised it, but what about the sound if there is a sub at 20-40 Hz, but in fact it can help or you don’t have to experiment with it ?

#13 root March 27 2015

Here's what to try:

• connect a 47-100 kOhm variable resistor to the amplifier input to adjust the volume. The middle leg of the resistor goes to C6, one of the outer ones goes to the ground, after which we send a signal to the remaining outer leg and the ground.
• Between pin 1 of the microcircuit and ground, connect a 100 pF capacitor and a 30 kOhm resistor connected in parallel. Set capacitor C6 to 0.47 - 1 µF, not electrolytic.
• To connect the player and other signal sources to the amplifier, use a shielded cable, connect the screen itself to ground (common) in the diagram, it will also serve as a minus.

#14 Alexander March 27 2015

Using this circuit, I put together a simple experiment about the speakers, but as it shows, it works normally, only the only noise is at the input, while I’m working on your advice, I’m trying to determine which capacitors are used we're talking about from which leg?

#15 root March 27 2015

According to the diagram that you provided, there is no point in turning on the speaker like this - the power delivered will be equal to the power of one channel, or even less. Look at the wiring diagram for the microcircuit in this article and compare it with the one you provided: legs 4, 2 (feedback) and 5, 1 (inputs). Bridged ULF is not just about connecting a speaker to the output of each channel.

#16 Alexander March 27 2015

eureka no noise, something was wrong with the power supply from the computer for some reason it made noise, then connected it to a trance with a block of capacitors and diode bridge it was the same thing, then I connected 2 small 10 uF capacitors from the ground to the radiators, then I connected the volume control 1 to 33 kom 0.25 watt and the other in series to 100 kom 0.25 watt and surprisingly, the noise disappeared, the background remained in the case from the power supply, it will probably be necessary going through all the capacitors in the power supply may need to be replaced, and I realized that you need to put trimmers at the input to reduce the input power by 47-100 kohms and variable volume by 47-100 kohms, and then the noise goes away.

#17 Evgeniy January 09 2017

Hello, dear radio amateurs, I would like to ask you for help... This is the first time a problem has arisen with this amplifier! Before this, I assembled an amplifier exactly according to your mono circuit and everything worked perfectly without any problems, but now the problem is the following: after assembling the amplifier, two resistors, R2 and R3, get wildly hot, the output sound is dirty and with wild interference. I checked everything carefully, there is no short circuit anywhere, the amplifier is assembled according to the same circuit and works great, I connect this one, and it... In general, I would really like to know, maybe the reason is that this amplifier is a TDA2005R, and the old one is just TDA2005? Please help me figure it out...(

#18 root January 10, 2017

Evgeniy, in your case you need to make sure that the power supply is powerful enough and the voltage drop under load is not very large. It is possible that one of the channels of the microcircuit is scorched or there is a manufacturing defect.
Heating of resistors R2 and R3 may indicate that the amplifier is overexcited and operates as a generator. The reason may be a poor layout of the printed circuit board, a malfunction of one of the capacitors or one of the channels of the microcircuit.
TDA2005R is more new option microcircuits, the connection is the same as for TDA2005. For this microcircuit, it is better to use a switching circuit with a voltage boost (boostrap), as in Figure 5, this will slightly increase the ULF output power.

#19 Alexander April 23 2017

In general, it is better and more reliable to always take diagrams from the datasheet itself. Then there will be fewer problems...