Miniature amplifier based on TDA2822L. Miniature amplifier on TDA2822L Block diagram of the tda 2822 microcircuit

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Hi friends. Today I will tell you how to make a small power amplifier on the tda2822m microcircuit. Here is the schematic I found in the datasheet of the chip. We will be making a stereo amplifier, that is, there will be two speakers - right and left channels.

Amplifier circuit

We will need:

• Chip TDA2822m.
• 4.7 ohm resistor (2 pcs.).
• Resistor 10 kohm (2 pcs.).
• Capacitor 100 MKF (2 pcs.).
• Capacitor 10 MKF.
• Capacitor 1000 MKF (2 pcs.).
• Capacitor 0.1 MkF (2 pcs.).
• Speaker (about 4 ohms and 3 watts) (2 pcs.).

Assembling the amplifier

We will assemble the circuit on something in between the hinged mounting and the printed circuit board. A piece of cardboard will serve as a board; we will attach all the parts to it.
For radio components, use a pin to make holes for the legs. In most cases, the legs will be in the role of tracks with which we will separate the entire circuit. The first thing we insert is the microcircuit itself, then we solder the plus leg of the 1000 uF capacitor to the very first leg.

Next, we solder a 4.7 ohm resistor to the minus leg, and a 0.1 μF capacitor to it (the capacitor has 104 marking). We also solder a wire to the negative leg of the 1000 uF capacitor, one of the speakers will go to it.

We do everything the same with the third leg of the microcircuit.
Next, we solder to the second leg of the microcircuit the plus leg of the 10 uF capacitor and the wire that will be the plus of the power supply.
To the fifth and eighth legs of the microcircuit, we solder the positive legs of the 100 uF capacitors.

We solder two wires to the sixth and seventh legs of the microcircuit - these are the right and left channels (the sixth is the right, the seventh is the left). We also solder two 10 kΩ resistors. This is where I had a problem. I found only one 10 kΩ resistor. Going to the store for one resistor is unwise, so I had to remember some of my physics lessons. Namely, how to calculate the resistance when connecting two resistors in parallel. This is what the formula looks like:

But this formula only works with two resistors, if there are more of them the formula does not work. I found resistors for 20 and 24 kΩ, these are some old Soviet resistors.

On this, almost everything is ready. It remains to deal with the ground, it will also be a power minus. All the remaining legs from the capacitors are 100; 10; 0.1 μF, as well as from 10 kΩ resistors, must be connected in one bundle. I connected all the ground on the leg of the 100 uF capacitor, in some places I had to connect with wires. Ground, also 4 leg of the microcircuit.

Also, the ground will be the minuses of the speakers. Now we solder the 3.5 mm jack. The copper wire is the ground, the red one is the right channel we solder to the sixth leg of the microcircuit (to the wire that was brought out earlier), the blue one is the left channel, we solder it to the seventh leg.

We connect the plus of each speaker to the negative leg of the 1000 uF capacitors. We solder the minuses of the speakers to the common ground. The plus of the power supply is the wire from the second leg of the microcircuit, as I said earlier, the minus of the power supply is the ground. This completes the production of the circuit. Let's cut the cardboard, if the compactness of the circuit is important, then the cardboard should initially be taken smaller, since there are few elements on the circuit.

Not so long ago I had an idea to practice making miniature devices. Without thinking twice, I went to the site of a regional seller of radio components and in the process of searching came across a wonderful solution in the form of a TDA2822L microcircuit. Now about our rams.

The TDA2822L is a low-power low-voltage integrated UMZCH, which has already been mentioned on this site (it seems like more than once). Its features are two channels, the possibility of power supply from a voltage in the range of 1.8 - 12 V (unipolar), low losses, the ability to connect via a bridge circuit and the presence of a solution in an SOP-8 package (not the smallest in nature, but still quite compact). And, by the way, "fool" it has 1 W per channel (with a 4-ohm load). That is, even with large powerful headphones, it is enough for the eyes (more on that later). And it costs $ 0.37. A fairy tale, and more!
The binding for it is minimal, and the UMZCH circuit according to the datasheet looks like this:

There is nothing fundamentally incomprehensible in this scheme, the details are typical, so let's go straight to the interesting, namely, the choice of parts.

Since we are assembling a miniature amplifier, it is clear that the maximum number of parts should be in smd version, in particular, I managed to do everything in smd except C4 and C5 (well, our store does not carry electrolytes for smd installation). As for the power supply, it is even more interesting - right from the moment the idea arose, I decided that I would power the circuit from a tablet like CR2032, since there is a wonderful small holder for them, and since almost all smd elements, then the space saving is good. But then, just in case, I decided to add two patch points for the wires on the crown, just as a reserve.

In total, our list of components:
Chip TDA2822L in SOP-8 package x1.
Tantalum capacitor 100uF x 10V x3 (most expensive part).
10 kOhm resistor 0805 x2
4.7ohm resistor 0805 x2
Capacitor 0.1 uF x2
Electrolytic capacitor 470 uF> 10 V (I have 16 V) x2

The result is such a cute "baby doll":

Disclaimer: the fact that you can get rid of the R0 jumper, inherited from the previous revision of the board, I noticed after I soldered the board, therefore it's too late and too lazy to fix it

As you can see, the dimensions are, ahem, small. To tell the truth, I did not even expect this, although the first version of the board was a little smaller and without a mask, but after making the seal it turned out that the electrolytes would have to be left hanging in the air. Along with the poor quality of the motherboard of the first version, I slightly enlarged and redesigned it, and everything went like clockwork (to tell the truth, almost like clockwork, one capacitor still "hangs").

Note: on the board, the microcircuit itself actually stands the other way around, compared to the diptrace project.

So, having a project in hand, we make a printed circuit board (as you like, I use FR + ammonium persulfate). A few photos on how this is done at home:

A little about how I soldered the board - first the battery holder, then the stereo connectors, then the microcircuit itself, then small smd elements, at the end of the tantalum and wires to the crown. The tantalum turned out to be the most nasty (I soldered the microcircuit with a hairdryer, not counting), because the spots for them are completely under the capacitor - therefore, it is inconvenient.

The final cost turned out to be about $ 3. (reagents, textolite, I do not consider). Here's a demo of what this amplifier can roughly do:

Below you can download the printed circuit board in the format

List of radioelements

Designation	A type	Denomination	number	Note	Score	My notebook
	Chip	TDA2822L	1	SOP-8		Into notepad
C1, C2, C3		100 μF x 10V	3	Tantalum		Into notepad
C4, C5	Electrolytic capacitor	470 uF x 16V	2			Into notepad
C6, C7	Capacitor	0.1 uF	2	Film		Into notepad
R1, R2	Resistor	10 kΩ	2	smd 0805

The TDA2822 is an integrated audio amplifier that can be used in both mono and stereo modes. The amplifier on this microcircuit is intended for use where small audio amplification is required, with low current consumption, for example, it can be used as a headphone amplifier. I have such headphones, they play normally from the computer, but when listening to music from the phone, there is clearly not enough power, connecting such an amplifier increases the volume several times and there is still a margin.

Supply voltage: 1.8 - 15 Volts
Maximum output power: 1.4 Watt
Consumption current at load: R = 32 Ohm and U = 6 V at rest 0.1 mA, and during operation it sways within 10-20mA.

Above, you see a small amplifier circuit using the TDA2822. The volume can be adjusted with a 10 kΩ variable resistor. A 12 volt power supply will be ideal for powering the circuit (there will be highest output power, excluding speaker impedance), but it will operate on lower voltages. The microcircuit does not heat up at all, so there is no need to use a heat sink. On the first board, separate large screw fasteners are brought out for input, output and power supply.

The PCB can be downloaded here:

Here is another circuit for turning on this microcircuit, as well as two printed circuit boards, which are more convenient for making a headphone amplifier, on one of them there are lower resistors and surface mount capacitors, and on the second there are DIPs. Tracks for 3.5 mm jacks are drawn on them, you can easily edit tracks and patches for your connectors. With such a handkerchief, you need to connect it to the phone (audio signal source) through a special wire with two jacks, and the headphones, respectively, into the connector on the board.

(downloads: 1476)

I decided to build an amplifier according to the second circuit using resistors (10k, 4.7) and 100nF surface mount (smd) ceramic capacitors. In the photo there are tracks drawn with a tsaponlak and a partimental marker and a finished board after etching in ferric chloride.

Adjusting the sound volume from the audio signal source itself will upset you, in my case it's the phone's volume rocker, the range is too small. To improve the change in strength, add a miniature variable resistor of about 10-50 kOhm to adjust the strength of the input audio.

An NM5 case with dimensions 57x38x19 and a ridiculous price was ideal for my board. The board fits into it perfectly, we drill holes of the required diameter for the input and output sockets. There is still room for an energy source in the housing. In my opinion, it would be best to shove a lithium-polymer battery there along with a charging module, for example, from a USB. As a result, we get an excellent, convenient, compact headphone amplifier and small speakers for a paltry price.

I used this amplifier for small computer headphones, the sound turned out to be pretty good, but at high volumes, the sound quality drops noticeably. I assembled the circuit, as you can see, using a TDA2822 in a DIP-8 package, and soldered a block to the board for convenience. The output power will depend on the resistance of the headphones and the supply voltage, we don't need much, we don't want to go deaf. It is desirable that the speakers are 2x1W / 4 Ohm.

I assembled a simple amplifier on the TDA2822M, and it started working right away

But due to an unsuccessful experiment, the micra burned out. Recently I came across a board with such a micro, and I decided to reassemble such an amp. So catch

The microcircuit, of course, does not give much, only 1W per channel, but for small speakers this is normal

Here is a circuit of a 2X1W amplifier on a TDA2822M taken from the datasheet

Nothing complicated with a minimum of details, I collected boards with weed in 20 minutes

Set of parts as usual

C1 = 1000mF (16V)
C2,4,6 = 100nF (104)
C3,7 = 470mF (16V)
C5.8 = 100mF (16V)

R1,3 = 10kΩ (brown - black - orange)
R2.4 = 4.7ohm (yellow - purple - gold)

Power supply 6-14V, 15V limit. Consumption 200mA

Assembled PCB Amplifier

Signet pattern from the side of the tracks

Signet for amplifier 2X1W on TDA2822M. Just like at home. This article has all the technology

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