The easiest Bluetooth speaker with your own hands. Such a bluetooth column will gather even a schoolboy.
Components can be bought on Aliexpress:

Bluetooth module bought here http://ali.pub/2uoo05
The charge controller bought here http://ali.pub/2ube3i
Round switches here http://ali.pub/2uoo93
Good 18650 batteries http://ali.pub/2uooe5

You will be able to assemble such a Bluetooth speaker as standard even without a soldering iron with your own hands.
This homemade product can be connected to smartphones, laptops, tablets, computers in one click. And the sound of a bluetooth speaker will be noticeably better and louder than regular laptop speakers.
For the basic version we need only 3 items.
one . Any old speakers with a capacity of at least 3 watts or speaker,
2. A charger from a smartphone or any other charger from an old phone with an operating voltage of 3.7 to 5 volts.
3. And the only thing you need to buy is the bluetooth module. With builtin 3W amplifier.
Included with the module are three chips. Red for power supply, in case we do not have a charger from the smartphone and 2we white for connecting speakers.
If you have two speakers, connect both chips. If the speaker or speaker is only one ... Connect one white chip
If you do not have a charger from a smartphone, but there is some other charger cut the chip .... The wires need to be separated, and slightly exposed. Of course there is a small risk, but the pure black wire is usually always and everywhere negative. We connect the black wire to the black wire to the power supply connector of the bluetooth module ... and the red one with the wire that will be second to your charger it can be red, white, or with a strip.
For charging will be responsible for such a charge module with a controller. It is designed for one battery, but I will connect to it 2. My batteries held 1800 mAh each. And we will connect the network button.
You get a cool homemade.
A few words about the light indication of the bluetooth module.
If the LED blinks twice a second this means that the bluetooth module is not connected to anything. If it is constantly on, then the connection to the device is established.
When playing music, the LED blinks 1 time per second. If the music is turned off or paused. the LED will light constantly. If the pairing is interrupted, the bluetooth module will blink again 2 times per second. If within 10 minutes no device connects the bluetooth module itself will turn off. This is good in case you forget to turn off the speakers. In the basic version, after such a shutdown, it is enough to pull out the charge and turn it on again. And in the version with batteries without a network button, restarting the bluetooth module quickly fails.
This is an excellent portable speaker with such characteristics for such money, of course, you can not buy anything. I think and you will not mind doing something like yourself. Especially if there are old speakers and chargers.
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