Hello. My name is Gennadiy, and I live in Odesa, Ukraine.

Maybe, you have old computer/home audio stereo speakers. Maybe, they don`t work due to some reason. Maybe, you want to fix it, like me. Let`s do it!

Step 1: Old Life...

These are just ordinary 2.0 stereo speakers with a built-in 2x15 W power amplifier - SVEN AF-11. Wood case, volume, tone and bass regulators, aux in - good speakers from past. I used him with my personal computer and DVD player for the home cinema. But one day it was doesn`t turn on - power failure blow up the internal power supply and amplifier.

I have two ways - repair the old amplifier or try to do something new. I choose the harder, but more interesting way.

Step 2: New Possibilities

First, we need to replace the amplifier. I chose 2x15 W amplifier from Aliexpress (link). Miniature, but powerful board, powered by 12V power supply. I used an old power supply from the non-working notebook with 15V, in this case, need to lower the voltage to 12V. For this, I used LM2596S - DC-DC adjustable step-down voltage regulator from Aliexpress (link). Cheap decision with high quality. All work without active cooling, but a radiator for the amplifier is recommended. So, old characteristics were restored.

Add new possibilities. For example, MP3 playback and FM radio. I chose a car MP3 player with remote control from Aliexpress. Attention!There are different versions - 5V and 5/12V! I bought a 5V version and burned him with a 12V power supply, then I had to buy a new one :)

Remark: I know about other boards with integrated BT receiver and power amplifier, for example, 2-in-1 board from Aliexpress (link), or Hands-free set from Aliexpress (link), but I used these boards for one reason - these modules are from other my projects. If you re-used electronic waste - you save the planet from garbage!

Step 3: Extra Possibilities

Something is missing...Something "up-to-date"...For example, a Bluetooth connection for wireless music playback. Yes, that`s it!

And again, we have two ways: buy an integrated board (BT + amplifier), or just add a BT receiver to our system. I chose the second way.

Question: Do you want the cheapest Bluetooth upgrade? No problem. See this: stress relief spinner - toy of the year. If you have one broken Bluetooth spinner like me, then just add him to our sound system. This toy has one audio channel (mono), so we need to connect both inputs on AUX IN on the MP3 decoder board.

This toy works with 3.7v Li-Po battery and charging from a standard 5v mobile phone charger, so just cut the battery and connect the charger to the micro USB port.

Also, you may use another LM2596S module, but this way is not cheap.

(Good idea is to use 78L05 - voltage regulator on the MP3 decoder board, but NO. This regulator is very low-power, just 100 mA, this is not enough for the working of spinner board.)

Remember: this project is just for growing the skill of electronics and soldering knowings. Is not a serious project and I do him for fun only. There are many ways to repair the speakers, and this is just one of them. Do not be afraid to try and you will succeed. Good luck.