Amplifier on tda2005 bridge circuit. Active speaker system based on TDA2005 IC
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 circuit was copied from the book “Modern Amplifiers” by S.R. Bashirov
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
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TDA2005— stereo amplifier with an output power of 10 watts per channel and unipolar power supply. The supply voltage ranges from 8 to 18 volts (typical 14 volts), load resistance from 2 to 8 ohms. Protection against short circuit, overheating and overvoltage up to 40 volts.
Among the features of this microcircuit, it should be noted the high sensitivity of the 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 amplifierThe output power of the presented homemade amplifier is 10 watts per channel. The microcircuit can deliver higher power, but in this case it is necessary to use a bridge 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 the simple switching circuit 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.
Does not require adjustment. It only requires a little time to assemble and mount it into the case if desired.
The amplifier specifications for the TDA2005 are as follows:
- Supply voltage (V) - 6-18
- Peak output current (A) - 3
- Quiescent current (mA) - 75
- Reproducible frequency range (Hz) - 40-20000
- Total harmonic distortion (%) - 1
- Nominal load resistance (Ohm) - 3.2
- Minimum load resistance (Ohm) - 2
- Output power (W at supply voltage 18 V) - 22
- Input sensitivity (mV) - 300
- Gain (dB) - 50
In this article I will offer you three board options for a mono amplifier and one option for a stereo amplifier.
This amplifier has proven itself to be simple, reliable and unpretentious. It is most often built into homemade home guitar cabinets (i.e., suitable for guitarists), as well as in low-power car radios (especially in the 90s). Don't let the phrase "low power" scare you - the gain of this microcircuit is enough to scare the neighbors. It’s just that 20 W for a car now is really nothing compared to kilowatt amplifiers and speakers, which can easily burst your eardrums when turned on at full power.
Let's start with the board, which, in my opinion, has the most successful ground layout.
Here is the diagram, board, arrangement of parts on the board and parameters of the amplifier parts on the TDA2005:
Simple mono amplifier board based on TDA2005
Layout of parts for a simple mono amplifier on TDA2005
Parts List:
It was the version with this board that I built into my conversion of the Soviet S30 speaker into a guitar combo amplifier.
There is no need to mirror the board.
After assembly it turned out like this:
Only in the photo there is a very small radiator. For an amplifier on TDA2005 you need more. Therefore, it was replaced with a larger radiator.
Now let's move on to the rest of the PCB layout options.
The second version of the mono amplifier board on TDA2005.
How to solder the volume control and signal wires:
The third version of the mono amplifier board on TDA2005.
Choose any option :) I liked the first one better.
Now to the stereo amplifier on the TDA2005.
His fee is a little more:
And the scheme is a little different:
Let me remind you that the stereo amplifier on the TDA2005 develops half the power of a mono amplifier. However, you can always assemble two mono amplifier boards and get stereo. Only power is needed with the same voltage, but a current of about 5-6 A.
It remains to show one more version of the mono amplifier circuit recommended by the manufacturer.
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!
After a little thought, I chose a well-known microcircuit as a base TDA2005 (TDA 2005). Many will ask what's good about it?! Let me give you a little clarification on this:
- Firstly, the power source for this microcircuit can be a 12-volt unipolar source. That is why it is an excellent basis for making a budget car amplifier.
- Secondly, TDA2005 among its “peers” is distinguished by higher quality and a bandwidth from 30 Hz to 20 kHz, with a nonlinear distortion coefficient (THD) of only 0.3%. This is truly a unique indicator, since most such microcircuits have a SOI of approximately 10%.
I assembled the circuit using a hinged method, without the use of circuit boards; all parts were finally filled with heat-resistant glue. The circuit I assembled received a stereo connection option, although using a bridge circuit, this microcircuit could output about 24 watts. This option is the optimal solution for a low-power car subwoofer. The main advantage of this method is that there is no need for voltage conversion.
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 is 0.25 watts;
- Be sure to purchase input wires with shielding, this will protect you from 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.
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 efficiency of the microcircuit goes to heating, 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 larger radiator.
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 sensitivity of the amplifier to low frequencies depends on the capacitance of the input capacitor. 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.
