The TDA2005 microcircuit has two inputs, as well as two outputs, which makes it possible to assemble a stereo amplifier based on it, which can operate at a load of 2 Ohms or more. A stereo amplifier, given its low output power, can be used when designing speakers for a personal computer.
Main characteristicsTDA2005
Supply voltage from 8V to 18V;
Output power (4 ohm load) per channel 6.5W;
Peak output current 3.5A;
The range of amplified frequencies is from 40Hz to 20kHz.
More detailed characteristics can be found in.
The TDA2005 chip has two switching circuits, for two outputs (stereo) and for one output (bridge circuit). I’ll tell you about the first connection circuit, that is, about a stereo amplifier.
TDA2005 electrical circuit diagram:
Electrolytic capacitors with a capacity of 2.2 μF 16V are used as C1 and C2. Capacitors C8 and C12 are ceramic; if you don’t mind, you can use film capacitors. Capacitor C5 is ceramic, soldered on the back of the board between pin 9 and ground. All other electrolytic capacitors should be rated at 16V if the amplifier supply voltage does not exceed 12V DC, otherwise use electrolytes at 25V.
All resistors indicated in the diagram must have a power of 0.25 W or more (if not 0.25 W).
According to the datasheet, resistors R3 and R6 should have a value of 3.3 Ohms, I set them to 30 Ohms, it works fine. In most circuits on the network, these resistors are installed with a nominal value of 33 Ohms.
The second version of the printed circuit board differs in its layout (there is a common point), and also in the fact that film capacitors are used as C1, C2, C8, C12, but this does not affect the sound quality of such an amplifier. Ceramic capacitor C5 is also soldered to the pins of the microcircuit on the back side of the printed circuit board.
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 this case, there are more options, I’ll give you the ones I came across:
- 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 a high-capacity 12V battery.
- It is possible that 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.
- 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).
- 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 5 minutes the electrolyte capacitor C5 heats up, and interference 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? - you need to power it with rectified constant voltage - a step-down transformer + diode bridge, at the output we get a constant voltage.
#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 a 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 a powerful power supply;
- 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 this situation, the amplifier perceives interference from the signal source, a whistling sound from the computer from the DVD player, clicks from the computer, small whistling sounds from the phone, barely perceptible but there. I sinned on the power supply, connected it to the computer unit and the same thing, then I wandered around various sites and found 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 mains, raised it, but what about the sound if the sub is at 20-40 Hz, but in fact it can help or can you not 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 coming 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 there is no noise, for some reason it was noisy with the power supply from the computer, then I connected it to a trance with a block of capacitors and a 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 com 0.25 watt and another in series at 100 kom 0.25 watt and surprisingly, the noise disappeared, the background remained in the case from the power supply, you will probably need to go through all the capacitors in the power supply, maybe you need to replace it, and I realized that you need to put trimmers at the input to reduce the input power at 47-100 com and variable volume at 47-100 com, 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 a newer version of the chip, the inclusion 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...
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.
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.
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 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 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 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 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 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 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 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!
Post Views: 221
