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This Mono Amplifier Circuit is Super Easy To Build

February 9, 2015 By Øyvind Nydal Dahl 4 Comments

PCB Layout of the mono amplifier circuitThis is the easiest mono amplifier circuit to build, as far as I know.

I love it because it is powerful enough to play pretty loud. And it doesn’t need a pre-amp, heat-sink or any weird transistors.

All it requires, is a few standard capacitors, a couple of resistors and a potentiometer.

It will give you 4.7 Watts of power. This should be enough to play music in the park with some friends and a couple of brewskies.

I’ve added the schematics, PCB design and Gerber files a little further down the page.

It’s also possible to make a stereo amplifier circuit, with some small changes to the circuit.

Mono Amplifier Circuit Diagram

Mono Amplifier Circuit Diagram (Schematics)

Parts list:

PS! There are no C1, C2 or C10. The reason for this is just that I added and deleted some capacitors in the schematics, and forgot to rearrange the numbers.

PartValueDescription
C3100µFPOLARIZED CAPACITOR
C4100µFPOLARIZED CAPACITOR
C5100µFPOLARIZED CAPACITOR
C6100µFPOLARIZED CAPACITOR
C7100µFPOLARIZED CAPACITOR
C8100µFPOLARIZED CAPACITOR
C90.22µFNON-POLARIZED CAPACITOR
C110.15µFNON-POLARIZED CAPACITOR
C120.15µFNON-POLARIZED CAPACITOR
TEA2025TEA2025BAmplifier chip
SPKR4-8 Ohm speaker
R11KResistor
R21KResistor
R310KLogarithmic Potentiometer

How To Build It

You can build the mono amplifier circuit on an experiment board. Such as a stripboard. It’s simple enough to do that. And you can use only through-hole components.

Or you can design your own printed circuit board. This is a good idea if you want to create several mono amplifier circuits. Or if you just want to practice your PCB design skills.

Either way, you have to make sure you place the capacitors the correct way. In this circuit, we use polarized capacitors. Polarized capacitors have a plus-side and a minus-side. They must be placed accordingly.

There are a few non-polarized capacitors too. You can place these whichever way you want.

Power the circuit with 3 to 12 volts. But, you need 12 volts if you want to get full power out of it.

And if you are a bit lazy – here you go:

Download Eagle schematics, PCB design and Gerber files

The TEA2025 Amplifier Chip

The thing that makes it possible to create a mono amplifier circuit so easily, is the TEA2025 chip. As far as I have seen, it’s one of the simplest chips to use.

It is an old chip, so it might not be available for too long. The old and cool chips have a tendency to go out of production at some stage.

But at the time of writing (February 2015), I can see that it’s available in several online stores.

You can use www.findchips.com to – you guessed it – find chips ;)

Return from Mono Amplifier Circuit to Circuit Ideas

Filed Under: Article

Reader Interactions

Comments

  1. JhonDoe says

    December 29, 2015 at 7:31 am

    whata kind PSU did you use?

    Reply
    • admin says

      December 31, 2015 at 2:55 pm

      You can power the circuit with anywhere from 3 to 12 V. 12V gives you the most power from the speaker. I tried with a simple 9V battery and it worked fine.

      Cheers!
      Oyvind

      Reply
  2. Anthony Esporlas says

    August 2, 2018 at 7:22 am

    Can I used this amp to my electric guitar?

    Reply
    • admin says

      August 9, 2018 at 7:22 pm

      Yes you can. Here’s someone who has made a similar circuit: http://www.tinkerplayground.com/projects/lm386-low-voltage-guitar-amp-12

      Reply

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