Portable Bluetooth audio receiver

This “small” box allows wired headphones to receive audio via Bluetooth. A clip lets you attach it to your clothes, so you don’t have to carry a smartphone on your body when you’re working out or deal with a tangled cable when walking down the street.

The following components are installed:

  • 5.0 Bluetooth audio receiver module
  • Boost converter “MT3608”
  • Charge controller “TP4056” for lithium cells
  • Switch
  • Battery from a disposable e-cigarette (Elf Bar 600)

The 3D printed housing is made from 100% recycled PETG.