I have been looking for a good stereo amplifier circuit diagram for a long time. I am not a HiFi geek, I just wanted to build a simple stereo amplifier that could drive some speakers for my desktop computer.
All the schematic diagrams that I could find seemed to involve lots of hard-to-find components or you had to use it together with a pre-amplifier or some other amplifier stage. It was always something that made me hesitate.
But recently I found this awesome little chip called TEA2025! You only need a few capacitors to make a decent stereo amplifier out of it. It is so simple to build that I put it together on a strip board in just a few hours.
2.5W * 2 Stereo Amplifier
The amplifier circuit diagram shows a 2.5W * 2 stereo amplifier. You can also make a 5W mono amplifier out of it. (Check out the TEA2025 datasheet for more information on that)
On the input side, you should use a dual potentiometer. A dual potmeter allows you to connect both left and right channel on one potentiometer.
This amplifier is great to use together with some speakers to get sound on your desktop computer. I am thinking of putting one in my kitchen and in my bathroom also. Then maybe hook them up to my home network and stream music from a server =) There are many possibilities when you can make such a cheap amplifier.
Amplifier circuit diagram and parts list
Parts list
| Part | Value | Description |
|---|---|---|
| C1 | 100µF | POLARIZED CAPACITOR |
| C2 | 100µF | POLARIZED CAPACITOR |
| C3 | 100µF | POLARIZED CAPACITOR |
| C4 | 100µF | POLARIZED CAPACITOR |
| C5 | 100µF | POLARIZED CAPACITOR |
| C6 | 470µF | POLARIZED CAPACITOR |
| C7 | 100µF | POLARIZED CAPACITOR |
| C8 | 470µF | POLARIZED CAPACITOR |
| C9 | 0.22µF | NON-POLARIZED CAPACITOR |
| C10 | 0.22µF | NON-POLARIZED CAPACITOR |
| C11 | 0.15µF | NON-POLARIZED CAPACITOR |
| C12 | 0.15µF | NON-POLARIZED CAPACITOR |
| TEA2025 | TEA2025B | Amplifier chip |
| SPKR1 | 4-8 Ohm speaker | |
| SPKR2 | 4-8 Ohm speaker | |
| R1+R2 | 10K | DUAL Potentiometer |
Total cost of the components (excluding speakers) is about $9. The most expensive component is the potentiometer (about $3-4).
Download Eagle schematics and board layout
Here is the schematics (Eagle), PCB board layout (Eagle) and Gerber files. This board was made to comply with the design rules of Seeed Studio (May 2013).
Stereo-Amplifier-TEA2025-(Eagle)
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Hello Oyvind,
Thanks for this useful post. i tried this single chip stereo amp. and it worked. but the problem I faced is there is lots of noise also. first i thought it could be a problem with speaker I used (i got my speakers from toy cars,they lied in the said resistance range), so I moved to market available speakers. but the problem persist. Can u suggest me some solution to get get the rid of this noise. any help will be appreciated.
Thanks and KEEP SOLDERING 🙂
Hey Ravi!
Cool to hear that you made the circuit =)
If the input signal is too high, you will get clipping on the output. This will make the sound noisy.
So first, check if you have the noise problem when the volume is turned down: (R1+R2) pot turned to a high resistance value.
Cheers!
Oyvind
Thanks for your quick reply,
I tried your suggested solution and yes the noise is still present at lower volumes.
And then just for experiment I used higher range speakers(~15 ohm , 5 watt), and the problem was gone :).
but i also doubt that using these higher higher range speakers ,in a continuous run, the circuit might get damaged. Right?
And one more thing , i think i should add, I am using USB power supply. As I want to make it completely portable.
Thanks. 🙂
No it shouldn’t be a problem to use higher Ohm speakers. And higher Watt-rating of the speaker just means it can handle more power.
Maybe your old speakers just had too low Watt-rating…
Anyway, great that you got it working! =)
Cheers!
Oyvind
That’s the issue. The IC is probably running out of power. Buy a tablet power supply (5V 2A, for fast charging) and check current consumption with a multimeter. Probably the USB port isn’t providing enough current (check if your motherboard has a port with a higher current limit, since most ports are limited to 300-500 mA). Or buy a 9V rechargeable battery (raising the voltage to get the same power from the supply will give you less current consumption, which is nice running on batteries).
Check the input stage for bad solder joints (can act as diodes hence radio noise). Try a aluminum foil shield to check for external signals that show up as noise. Have an oscilloscope? Check for oscillations in your component layout etc.
Good luck!
Hey sir . Is there any shop have a complete part list for this stereo amplifier ? which is the Layout in PCB ?
use battery as power supply. dont use transformers
i like electronics
Hey, thanks for the great schematic, I was actually looking to make an audio amp and this one looks awesome! Although, I was looking for a way to turn this into a 5 Watt mono amp on the datasheet, but couldn’t find anything. :/
Any help, or am i just being stupid? Should I just use a mono amplifier with similar specs as the tea2025?
Thanks in advance!
Check out page 4 on the datasheet. The mono configuration is called “Bridge”. It’s the one on the left.
Cheers!
Oyvind
Thanks! I was wondering why that was there, but I just assumed it was a separate application entirely because of the name!
love it…i am just 14..but i am interested in these subject…so thank u man
Pls oyvind,help me here also(i will download your book sooner by grace)can you provide me with a schematic of 4 stage transistor 2.5w mono or stereo audio amp.pls spare the effort to send me the link to this.God bless.
Hey Ikenna
I don’t have that, but maybe you can find something here: http://www.build-electronic-circuits.com/free-electronic-circuits/
Cheers!
Oyvind
i hav took this ic from my creative speaker and some other parts and made the circuit.but it is not working.i didn’t receive any response from speaker .can u make a video in makin this circuit in breadboard. plz help me
If you have access to an oscilliscope (http://www.build-electronic-circuits.com/sound-card-oscilloscope/), I would recommend you to use that and measure both input and output to figure out what is wrong.
Cheers!
Oyvind
hello,
thanks for this
i love boobs =)
I think you’re on the wrong website for that……
K lol
hye….
admin,
what is the maximum input of this circuit?
and what is the output power for this circuit?
Hi,
I challenge you to figure it out from the datasheet: http://www.bookly.com/images/TEA2025.pdf
Cheers!
Oyvind
sorry
‘what is the output power ?’ this Que. was ask by mistake
I know output power is 5watt
I mean to ask what is current consumption of this circuit?
or what is power consumption for this circuit?
You can find this info in the datasheet of the TEA2025 chip: http://www.bookly.com/images/TEA2025.pdf
Cheers!
Oyvind
what is the voltage rating of the capacitors.
I think I used 25V.
Oyvind
please tell me the function of pin n0.1 of tea2025b
Not sure what pin that is, but check the datasheet and you will find info on all pins: http://www.bookly.com/images/TEA2025.pdf
Cheers!
Oyvind
Why Do We Use Capacitors in this circuit.. 🙂
is the voltage rating of all the capacitor 25v.How about 0.15uf capacitor.
25 V should work fine.
Oyvind
can i use a 50k ohm dual pot like this:
http://www.ebay.com/itm/2PCS-ALPS-Potentiometer-RK16-50KA-2-Sound-Controller-/260439149067
Hey, yes that should work fine.
Cheers!
Oyvind
i have only 10k 6pin potentiometer avaliable….
so could you tell me how to wire it in above circiut…
please!
thanks in advance
Hey,
Check the datasheet of your potentiometer to find out the pin configuration, then match that with the diagram above.
Cheers!
Oyvind
Where would I be able to order the 0.22 µF and 0.15 µF non-polarized capacitors online?
Hi,
For example from Jameco: http://bit.ly/1fsYy5h
Here are some more suggestions: http://www.build-electronic-circuits.com/electronic-component-distributors/
Cheers!
Oyvind
What is the diagram software that you used to create these circuit diagrams? Is it creately ?
Hey Shalin,
It’s Digikey’s Schemeit: http://www.digikey.no/schemeit/
Cheers!
Oyvind
i have a problem with my omega digital karaoke amplifier AV 9715 it make a noise on the speakers i cant hear the sound clearly and its screen dnt display but my main prblm is the sound. Is it the capacitors or can it be the ic 7812 or the sound ic’s on the aliminium plate but they dnt get hot and i also test the voltage on the 7812 input is +- 26v and out is 12v how can u help me i just want 2 knw what to change or replace 4get abt the display i just need the sound first i will appreciate it very much u can email me what 2 do 2 fix it myself on [email protected] please i really need help thanx
can i plot this circuit on proteous software? i made this circuit on proteous but it’s not working. pls help me
Hi,
I doubt that you find something that will simulate the chip, if that’s what you are trying to do… I would say just go ahead and build it. No need to simulate.
Cheers!
Oyvind
Hi Mr.Oyvind,
I manage to make my amp work but the problem i am facing now is the output volume is too low ,can you please help me?
I use 50v for all polarized capacitors and 100v for non-polarized ,20k potentiometer and powered by 3v rechargeable battery.Thanks in advance .
Hi Andy,
If the sound is very low, you can try to increase the volume of your input device. And make sure the potentiometer is at it’s lowest resistance.
But don’t expect a really loud sound when you’re using only 3V for power.
Cheers!
Oyvind
if I don’t have a .15 or .22micro farad. what capacitor can I substitute?
If you can’t get a hold of those capacitor values, try something that is as close as possible. You can also combine capacitors in parallel or series to get other values: http://www.build-electronic-circuits.com/series-and-parallel-circuits/
Cheers!
Oyvind
can I use a 1micro farad for the .22 and .15?
Hey, I built this circuit but I’m facing a problem, I’m not getting output in the 2 channels only in one, why could this be?
Hi, this could be because there are only inputs on one channel. Or it could be that there’s a short-circuit or something on one of the outputs. Try switching the inputs and see if this gives you an output on the other channel.
Cheers!
Oyvind
HI TO ALL AND GOOD NOON,
IF ANY ONE CAN HELP OUT.
ACTUALLY I AM LOOKING FOR READY MADE PRINTED CIRCUIT BOARD FOR KARAOKE SYSTEM (AMPLIFIER SPEAKER, IT HAVE USB TERMINAL AND 2 MICROPHONE + RECORDING FACILITY IN THAT SAME AS LIKE (PURE ACOUSTIC 1215 MODEL)
NEED 2 SET OF AMP. IF ANY ONE IS HAVING THE SAME PLS SHARE THE DETAIL MY NO IS 9004049095.
hi , i’m still curious , when use 9 volt of power is the ic become hot or not ?
thanks
Hey,
I think it will become a bit hot yes. But not more than it can handle.
Cheers!
Oyvind
I have purchased 600W sterio amplifier with USB and mic-2 kit i want to understand bass treble and volume wiring in 6-pin pot
I have just finished asembling the bridge version and I am impressed of the quality and the power of this IC!
Yeah, it is pretty good, right? I’m often using it to play music at home.
Oyvind
Hi, im up to build this little amp for my desktop pc (the built-in speakers are just terrible)
I haven’t seen the lay out yet (as i don’t own any software for that purpose) but there is a pic at the beginning of the topic that brought a simple question to me:
Is the layout drsignes to be used with a double sided copper board .?
Thank you 🙂
Hey,
The design I created was double-sided. But it shouldn’t be too hard to make a single-sided design if you want to do that.
Best,
Oyvind
i need your e-book
Resonating on the curcuit
I use to make amplifiers from the internet and it makes little hmmm noise when the volume is attached. Please may know what could the course
Hi,
The incoming signal could be too high. The amplification could be too high. There could be noise in the incoming signal.
Best,
Oyvind
haai brother my name is sandeep from Kerala I made this amplifier, no any problems ,now I am using this amplifier to my headphones, brother you are great ,don’t damage ur health ,take care bro thanks sandeep
How much voltage rating should have 100uf capacitor for this circuit. Can i use 25v capacitor???
Can i use single sided pcb
Yes, 25V should be fine (I think).
And yes, single-sided pcb works fine.
Best,
Oyvind
hello sir this tharun I just want to create tv signal jammer in that many circiuits are there I just want to solve and create a tv jammer or hotspot jammer I will buy what ever u say
can we use 50v capacitors for the circuit ,and how to generate groove
Yes you can. I don’t know what groove is.
thanx
groove means
sub woofer effect
Ah ok. So you want more bass? With this circuit my best guess would be to add a low-pass filter on the input side. Haven’t tried it though, so I don’t know how the effect will be.
thank you so much.i’ll try.
Hey, how can I add the input to the speaker? I am a complete beginner to it and don’t know how to do it. Also, can you help me with the Potentiometer?
Hi,
The input does no go to the speaker. The output goes to the speaker.
You can read about the potentiometer here: http://www.build-electronic-circuits.com/potentiometer/
Best,
Oyvind
hye admin…can i use 9v bttry for this ciruit….thanks
Yes you can.
Why u was use soo many cap in circuit…..??
For filtering or to avoid oscillations. You might be able to skip some of them, depending on your power source.
Best,
Oyvind
I have a transformer 230/12V , with this can I give supply power for the chip after converting it to DC? Is the circuit is able to withstand the power supply?
If you have the correct DC voltage in, the circuit is fine as long as the power supply can prove enough current.
Hello Oyvind,
Thanks for this website. It is very helpful. I want to try making a portable audio amplify for devices like cellphones, mp3 player, etc. with an SD card slot and a USB charging port for a 3.7 voltage battery.
But I haven’t got a faintest idea where to start with a circuit. Any clue Oyvind would be really appreciated.
Hi,
Well, I guess this article is a start. Here you build the amplifier. For the other parts of the project I don’t have any articles unfortunately.
wishing you success. buy how am I make local transformer
If I want to make it Mono, I ignore one of the inputs?
Yes you can. But if you want more power, check the datasheet for how to connect the outputs in mono-setting.
Best,
Oyvind
I need to boost a signal sixfold before I divide it by 6 to send to 6 different destinations. Can this be done with an LM386? Also, I do not seem to be able to make the LM386 specs give me hints on how to do it.
The amplification part should be possible yes. Check out page 5 in the datasheet for circuit examples:
http://www.ee.ic.ac.uk/pcheung/teaching/DE1_EE/Labs/LM386.pdf
Best,
Oyvind
Clearly I need to learn how to read a spec sheet. Any pointers?
On page 5 you’ll find “Typical Applications” with several circuit diagrams. Connect the circuit diagram as in the one marked with “Amplifier with Gain = 20” and you get 20-fold the signal.
If you need exactly 6, you can play a round with the resistance on the input.
For splitting the signal, you can use resistors for basic splitting. Google “signal splitter circuit” to see some examples
Hello, I am facing a strange problem with this circuit. The whole circuit wired up this way results in one working speaker while the speaker connected to pin 2 and 3 doesn’t work. I am powering this circuit 12v just so you know. When I was tinkering with the circuit, I found that removing the 470uF capacitor connected to non working speaker and shorting the wire, the speaker starts receiving sound but now the output is way too noisy. I tried replacing the capacitor but nothing happened. Do you have any idea?
It could be a broken capacitor…
hi i tired to build this aplifier system but the problems is low sound
Check the sound level of your music source.
Best,
Oyvind
hlww..i made this circuit and it works great..thank a lot… 🙂
i have a question..can i use two outputs in one speaker??
if i can then how to add??
Cool!
Yes you can. Check out “Bridge application” on page 4 of the datasheet:
http://www.bookly.com/images/TEA2025.pdf
Best,
Oyvind
Hy guys my problem is i dont know where to buy those printed circuit boards i live at durban.so idnt know where to find those boards for soldering and how much is it?
This is a really cool thing! I am new to electronics so I have a stupid question. How can I connect the two inputs to my laptop if I build this on a breadboard?
Hey Kirk,
You need to use an audio mini jack to plug into your laptop. Mini jack on one side, loose wires on the other side to plug into your breadboard.
Best,
Oyvind
Thank you so much for the reply! Another problem I encountered is the TEA2025 chip seems to be a pretty old version and many electronic shops are out of stock. Could you tell me where I can buy it since I wanna start building it in a week? Thanks!
By using findchips.com I find that Quest Components has it:
http://www.findchips.com/search/tea2025
But in general it’s getting really hard to find. I’ll update this article soon with a new circuit with easy-to-find components (Hint: LM386)
Best,
Oyvind
I wanna make an amplifier use for 6 spkr..how can do it..please give sugges..and circuit
I made this circuit and worked perfectly well with only one input and output ,the other output produced noice ,i also made a pre amp ad on it and i made à microphone loud speaker .thanks
hi
This is a great little amp, but im working on a pet project for sound in my car involving, among others, this TEA circuit.
Here is my idea for ‘poorman’s’ radio:
I found various completed circuits out of hi-fi systems and portable radios. Im trying to use them all in my car as a complete built in system, without using a radio that can easily be stolen.
I have wireless bluetooth speakers that came with my phone that i want to put front in-dash, a TEA2025D circuit from an old treadmill and a TEA2025 that i got from an old hi-fi.
Individually, each one has great power, but i want to make them work together from one source, an auxilliary input and/or, the bluetooth link. Im only using my phone as the music player.
When i connect the one with the other, a lot of sound disipates or alot of static comes through, giving me the idea that one or the other is getting too much power or drawing too much.
i can give easch one its own input from the potentiometer, but that o lot of extra wiring in the car as the layout requires the one circuit to be in the back, powering those speakers.
Is there a way i can link them up together?
Please give me some advice. Youre welcome to have a good long laugh at my expence first, but my reasons for this idea is not to spend any money on the system and still get powerfull sound, while making sure nobody is tempted to break into my car when they see a radio in the dash. FYI, ive lost 4 radios in 3 months through crime and im done buying new radios.
Keep in mind, ive collected the proper size speakers for every amp circuit’s rated output.
Hope you can help
Thank you
sir
how can add a subwoofer or Base in this circuit
plz gide me