This video is a assembly instruction for DIY Bluetooth receiver. The receiver can connect to headphones, an amplifier and a car radio.
Bluetooth audio module: http://ali.pub/476mxd
Charging and protection module: http://ali.pub/476ndw
Suitable battery: http://ali.pub/476olu
Switches: http://ali.pub/476oyh
Engraving machine: http://ali.pub/4794pt

All parts can be bought cheaper with the Backit cashback service: http://ali.pub/459dl5

To make a Bluetooth receiver, you will need a bluetooth audio module with the ability to connect a lithiumion battery, a charge and protection board, the battery itself, a small switch and some kind of housing. As the case, I used an old pocket radio. To make a bluetooth receiver with your own hands, you do not need to have great soldering skills and knowledge in the field of electronics, the device circuit is very simple and can be assembled in 10 minutes.

Such a bluetooth receiver can be used to listen to audio through headphones, a home amplifier or car player via AUX. At minimum volume in the headphones, background noise is heard, but it is worth a little increase in volume and it is not at all noticeable. When listening through an amplifier, I did not notice noise.

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