Miniature amplifier based on TDA2822L. Miniature amplifier on TDA2822L How to make a bundle from DTA 2822
Not long ago I had the idea to practice making miniature devices. Without thinking twice, I went to the website of a regional seller of radio components and during the search process I came across a wonderful solution in the form of the TDA2822L microcircuit. Now about our sheep.
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 ability to be powered from a voltage in the range of 1.8 - 12 V (unipolar), low losses, the ability to be switched on 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, “stupid” it has 1 W per channel (at a 4-ohm load). That is, even with large, powerful headphones, it’s enough for the eyes (more on that later). And it costs $0.37. A fairy tale, and nothing more!
The wiring for it is minimal, and the UMZCH circuit, according to the datasheet, looks like this:
There is nothing fundamentally incomprehensible in this diagram, the details are typical, so let’s move straight to the interesting part, 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 design, in particular, I managed to make everything in SMD except C4 and C5 (well, our store does not carry electrolytes for SMD installation). As for the power supply, it’s even more interesting - immediately from the moment the idea arose, I decided that I would power the circuit from a tablet like CR2032, fortunately there is a wonderful small holder for them, and since almost all the elements are SMD, the space saving is good. But then, just in case, I decided to add two spots for the wires on the crown, just as a reserve.
Our total list of components:
Chip TDA2822L in SOP-8 package x1.
Resistor 10 kOhm 0805 x2
Resistor 4.7 kOhm 0805 x2
Capacitor 0.1 uF x2
Electrolytic capacitor 470 uF >10 V (I have 16 V) x2
The result is this cute “bobblehead”:
Disclaimer: I noticed that you can get rid of the R0 jumper, inherited from the previous revision of the board, after I soldered the board, so it’s too late to fix it and I’m too lazy
As you can see, the dimensions are, ahem, small. To tell the truth, I didn’t even expect this, although the first version of the board was a little smaller and without a mask, but after making the signet it turned out that the electrolytes would have to be left hanging in the air. In conjunction with poor quality I enlarged the board of the first version a little and redesigned it, and everything went like clockwork (to be honest, almost like clockwork, one capacitor still “hangs”).
Note: on the board the chip itself is actually the opposite way around compared to the deeptrace design.
So, having a project in hand, we make a printed circuit board (if you like, I use FR + ammonium persulfate). A few photos of how this is done at home:
I assembled a simple amplifier using a TDA2822M, and it worked 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 build such an amplifier again. So catch it
The chip, of course, does not provide much, only 1W per channel, but for small speakers this is normal
Here is the circuit of a 2X1W amplifier on TDA2822M taken from the datasheet
Nothing complicated, minimal parts, I assembled the boards with grass 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 = 10kOhm (brown - black - orange)
R2.4 = 4.7 Ohm (yellow - purple - gold)
Power supply 6-14V, 15V limit. Consumption 200mA
Assembled amplifier on a printed circuit board
Signet drawing from the track side
Signet for 2X1W amplifier on TDA2822M. Just like at home. This article has all the technology
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The TDA2822 is an integrated audio amplifier that can be used in either mono or stereo mode. The amplifier on this chip is intended for applications where small audio amplification is needed, with low current consumption, for example, it can be used as a headphone amplifier. I have these 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 the volume increases significantly and there is still some reserve left.
Supply voltage: 1.8 – 15 Volts
Maximum output power: 1.4 Watt
Current consumption at load: R=32 Ohm And U=6 V in rest mode 0.1 mA, and during operation it fluctuates within 10-20ma.
Just above you see a circuit of a small amplifier using a TDA2822. The sound volume can be adjusted using a 10 kOhm variable resistor. A 12 volt power source will be ideal for powering the circuit (will have the highest power output, not including 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 there are separate large screw fasteners for the input, output and power supply.
The printed circuit board can be downloaded here:
Here is another diagram for connecting this microcircuit, as well as two printed circuit boards, which are more convenient for making a headphone amplifier, one of them has lower resistors and surface-mount capacitors, and the second has DIP. The tracks for sockets for 3.5 mm jacks are drawn on them; you can easily edit the tracks and spots to suit your connectors. With such a board, you need to connect it to the phone (audio signal source) through a special wire with two jacks, and headphones, respectively, to the connector on the board.
(downloads: 1476)
I decided to make an amplifier using the second circuit using resistors (10k, 4.7) and 100 nF surface mount (smd) ceramic capacitors. In the photo there are paths drawn with tsaponlak and a permanent marker and finished board after etching in ferric chloride.
Adjusting the sound volume from the audio source itself will upset you, in my case it’s the phone volume rocker, too small range. To improve the change in sound strength, add a miniature variable resistor with a resistance of approximately 10-50 kOhm to regulate the strength of the input audio.
The 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 in the housing for an energy source. In my opinion, it would be best to stuff a lithium-polymer battery there along with a charging module, for example, from USB. As a result, we get an excellent, convenient, compact amplifier for headphones and small speakers at a meager price.
I used this amplifier for small computer headphones, the sound turned out to be quite good, but at high volume the sound quality drops noticeably. As you can see, I assembled the circuit using a TDA2822 in a DIP-8 package, and soldered a header onto 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 be 2x1W/4 Ohm.
TDA2822- one of my favorites microcircuits youth. Chip very, very good, versatile and has a wide range of applications. It can be found on low-power speakers for a mobile phone or, say, a PC; even self-respecting companies very often use this particular chip as the final power amplifier in portable speakers.
The microcircuit has a fairly wide range of supply voltages from 1.8 to 12 Volts, this makes it possible to assemble portable speakers battery or battery powered. But today we’ll talk about something else; we’ll use the microcircuit as a headphone amplifier in a car!
Why do you need headphones in a car? in fact, any car enthusiast knows that sometimes you have to travel with passengers who, to put it mildly, do not like loud music, and standard headphones connected to the player or car radio cannot provide the required level and quality of sound and the problem is not in the headphones, but in the amplifier which feeds them.
TDA2822 is one of the most best options in this matter, has simple diagram connections, compact dimensions of both the microcircuit itself and the circuit board, plus it is quite resistant to vibration and does not heat up during operation, therefore there is no need to use heat sinks, and this saves space and convenience!
The microcircuit can be used to amplify the signal from the player, and other sound devices, and to amplify the signal with mobile phone, as we know, on the road we very often cannot hear the interlocutor during a conversation, and an additional amplifier will help out in such situations.
The microcircuit itself must be connected to on-board network car through an 11 Ohm limiting resistor, otherwise the microcircuit may burn out when the engine is running. output power each channel reaches up to 1 watt, there is also a bridge circuit that will allow you to get power up to 2 watts, but in this case only one channel is formed. But the chip can be powered from lithium tablets with a voltage of 3 Volts or from other small-sized power sources.
