DIY 15 Watt Stereo Amplifier (Portable)





Introduction: DIY 15 Watt Stereo Amplifier (Portable)

Hello guyz!

One day, I had theese old Thompson bookshelf speakers just laying around, and I had no way to play them, as I don't posses any good amplifier, that would suit my needs. I also wanted this project to be portable, to be able to play music wherever I go.

Step 1: Get All the Parts Needed

Theese are the parts I've used. Some, like toggle switch, I've got from local seller, but most are available on eBay, so I provided links to all of them.

$5 TA2024 audio amplifier board -

(optional) $3 Bluetooth Audio Reciever -

$1 3,5mm cable -

$1 3,5mm block -

$1,5 Perf board -

$4 Box -

$1 Thermal Compound -

$2 Audio Connectors -

$2 MicroUSB Boost Converter -

$1 Main Switch -

The prices are approximate. I've got most of small components locally, for just a fraction of their ebay price, as no shipping is requiered. Overall, this is build under $15.

Step 2: Assemble Everything Like in the Video

Its very easy. As the board contains most of necessary electronics, we're only requiered to add power and extend the terminals and audio input. Before you put inside the boost converter, make sure to power it up and adjust the voltage using the potentiometer and voltmeter to check that its output is close to 12 volts. Then all you need to do is to make the enclosure. I had only drill and knife to use, but with Dremel it could have been so much easier.

Thats all!

Enjoy your new, budget-friendly DIY amplifier!



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    9 Discussions

    Nice one, and full marks for trying, but you might want to review your power supply to get the best out of your amplifier. The supplier where you bought the booster says 1A is optimum current without overheating, so keeping things super simple, you have 5V at 1A input, i.e. 5W. You boost this to 12V so now you have 5W/12V giving you at best 400mA output! 60mA of that is needed just to have the amplifier switched ON, leaving you with 340mA or 170mA per channel. Even if you could deliver every milliamp to the 8ohm speakers you would only have 0.23W output per speaker, so your thick output wires are kind of wasted. But if you are happy with it then... mission accomplished!

    2 replies

    Hi, thanks for response :) Sure I know about how much it draws, and even tho the chip is being marketed as 2x15w, testing on these 6ohm speakers with lab bench supply, I wasnt able to get output anywhere over 13watts of power being drawn from the PSU. Also, for my purpose of being mostly a portable device, and mainly for indoor/small area use, that is fairly enough power. My concern about the boost converter overheating and such thankfully did not come true. I've read online, that depending on the source/output voltage ratio, theese can be anywhere from 80-95% efficient. The short circuit current from my power bank was drawing around 5v/1.97a (usb charger doctor), thats 9.85watt. Short circuit current on boosted side was around 0.75-78amps. I know that won't break a glass, but it is still decent power from such a portable thing. Nonetheless, I'm also thinking about adding a DC plug on the back of the amp, as I'm having one spare ac adapter with 12v/1.5a, if I'd want to get crazy with power outlet nearby. I might add an update to this instructable.
    Anyways, hopefully you might consider this a bit better now.

    I'm really surprised at your 13W from the booster considering the spec the suppliers gave, but you did the measurements, so who am I, etc.? Anyway, those were my thoughts on the matter, and I am not judging you. I was just looking at the fat wires on the output and the relatively small ones on the input and scratched my head a bit. Anyway, thanks for sharing but you might possibly change the heading to scale it back a bit (?). ;-)

    Thanks for suggestion, gonna try it asap :)

    Nice, but why insert an add site before taking us to ebay?

    1 reply

    I had to shrink the links. But I'll find some other shortener, without ads.

    Looks simple enough! Thanks for sharing how you made this amplifier :)

    1 reply

    I'm glad you like it, as it is out of my many similiar projects the first one that I ever published here :)