Active speaker system based on TDA2005 IC. Active speaker system based on IC TDA2005 Tda2005 key chip

Recently a friend asked if I could build him a compact car amplifier. The problem is that he was not at all satisfied with the volume of the Chinese-made speakers and their sound quality, which was already installed in the car. Nothing complicated, so why not!

• Firstly, the power source for this microcircuit can be a 12-volt unipolar source. That is why it is an excellent basis for making budget car amplifier.
• Secondly, TDA2005 among its “peers” is more distinguished high quality and a bandwidth from 30 Hz to 20 kHz, with a nonlinear distortion factor (THD) of only 0.3%. This is truly a unique indicator, since most such microcircuits have a SOI of approximately 10%.

The car amplifier I made is capable of delivering 12 watts per channel, the number of channels is two. The current without taking into account the input signal is about 70 mA. The efficiency of the microcircuit is no more than 70% (everything else is spent on heating), so it works in class AB. It follows that for normal operation of the TDA2005 chip, a cooling system is required.

A unique additional method for reducing interference is to connect the microcircuit housing to the minus of the general power supply, but through a separate wire.

When purchasing components, select the following items:

• It is advisable to purchase capacitors for 16 Volts, and ideally for 25 Volts;
• resistors, the best option are 0.25 watt;
• Be sure to purchase input wires with shielding, this will protect against additional interference and extraneous sounds(for example, high-frequency noise emitted by the power supply or on-board network, radio waves, etc.).

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

TDA2005 — stereo amplifier with an output power of 10 watts per channel and single-supply. The supply voltage ranges from 8 to 18 volts (typical 14 volts), load resistance from 2 to 8 ohms. Protection from short circuit, overheating and overvoltage up to 40 volts.

Among the features of this microcircuit, high sensitivity should be noted input circuits, which can be successfully used, for example, to extend the battery life of a signal source or use it to amplify a very weak signal, for example from a tonearm for playing records.

DIY car amplifierOutput power presented homemade amplifier is 10 watts per channel. The microcircuit can give more high power, but you need to use a bridge switching circuit. The bridge circuit is many times simpler than the two-channel version and is capable of providing a fairly high output power - 25 watts per channel. The circuit is capable of developing such power only in peaks; the rated output power does not exceed 18 watts (Ohm's laws apply under any circumstances).

We select the input capacitor to taste - the larger its capacitance, the more sensitive the amplifier is to low frequencies; in fact, this capacitor is a kind of filter.

The installation was done on a breadboard; there was simply no time to etch the PCB. Two microcircuits were mounted on the board at once, each of them connected via a bridge circuit. The board also has a noise suppression filter, since the amplifier was planned for a car.

The noise suppression filter consists of a choke, an electrolyte and two film capacitors. The inductor is designed to smooth out HF interference, and the capacitors are for LF interference. Probably, each of us has encountered a problem when the radio or amplifier missed the noise of the car engine and, as a result, that noise was heard from the speakers. This filter can save the situation and is successfully used in almost all car radios (except old ones), so that you can assemble a filter circuit and use it in conjunction with a radio or homemade ULF.

The standard “pancakes” TDA2005 amplifier pumps with a bang - the bass is quite deep and dense, wheezing is observed only at maximum volume - but this is quite normal, since not a single microcircuit powered by 12 Volts can provide 100% high-quality sound at maximum volume (IMHO) .

To be honest, the TDA2005 is one of my favorite chips and I have my reasons for that. Firstly, the chip costs pennies (less than $1). The second reason is simple circuit inclusions and good output power.

The microcircuit must heat up during operation, so it should be installed on a heat sink.

The amplifier circuit on the TDA2005 has been tested dozens of times - it always worked without problems.

This low-frequency (LF) stereo amplifier circuit on the TDA2005, which is easy to assemble and configure, can be used as an additional module in a car, or serve as a replacement for a burnt-out power amplifier in various audio equipment, or after supplementing it with a circuit preamp with tone and balance adjustment, it can become a full-fledged audio bass amplifier.

LF amplifier on TDA2005 - design description

It is based on the TDA2005 integrated circuit, which has two independent outputs in its structure. The circuit is quite simple, so it won’t be too difficult to assemble it yourself.

The scheme operates in standard inclusion. The degree of bass amplification of each of the individual channels is determined by the resistance of resistors R3 and R5, which can be changed in the range from 10 to 47 Ohms. To dissipate heat integrated circuit TDA2005 must be installed on a radiator with an area of ​​at least 20 square meters. see. The radiator then needs to be connected to the common wire of the circuit.

Technical characteristics of the TDA2005 amplifier

• Supply voltage: from 8V to 18V;
• Maximum current consumption: 3.5 A;
• Output power: RL=4 Ohm - 20 W;
• Bandwidth (at -3 dB level): 40…20000 Hz;
• Quiescent current - 50 mA.

Bass amplifier assembly

Assembling the low-frequency amplifier circuit is quite simple and not particularly difficult. The parts are mounted on a board made of one-sided foil fiberglass. It is written in detail how to make it with your own hands. First, resistors and capacitors are soldered, paying attention to the correct polarity and the serviceability of the capacitors, which are desirable.

The TDA2005 chip must first be attached to the heatsink and then installed on the board. After carefully checking the installation and the absence of errors, we connect the speakers to 12 V. Next, you need to measure the current consumption. At rest it should be at 60 mA. Power source with a voltage of 12 - 15V and with a load current of more than 1.5 A. The capacitor in the power supply filter must have a capacity of at least 4700 μF.

Satisfied after assembly, I decided to assemble 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 is an 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 wide range supply voltage 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 car amplifier circuit based 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 already at 3 volts, although not very well, at low frequencies choking. 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 bookniness decreased noticeably

Well, at 10 kHz something terrible and incomprehensible is happening

As you can see high frequencies It’s not his, the amplifier can’t handle 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 make this amplifier “people's”. 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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A couple of days ago a person asked me if it was possible to replace the TDA2004 chip with a TDA2005. This is analog.

In this regard, it was decided to assemble another amplifier on the TDA2005, since there is one, this circuit will be a bridge circuit, which makes it possible to squeeze 20W out of the chip

Everything will be brief and clear, in other respects, as always

The diagram was copied from the book " Modern amplifiers» Bashirov S.R.

Set of parts:

IC1 = TDA2004,TDA2005

C1,7,5 = 100nF (104)
C2 = 3300mF 16V
C3,6,8 = 10mF 16V
C4.9= 100mF 16V

R1.4 = 1k 0.25W (Brown - black - red)
R2,5,7 = 1 2W (Brown - black - gold)
R3.6 = 15 2W (Brown - green - black)

Signet for 20W amplifier on bridge TDA2004R(TDA2005)

As always, everything is brief, but understandable (I hope). Please ask questions in the comments

Guard: Do you like House 2? And I went. I wonder what will happen next?

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