• 1
    Step 1

    First I made the electric contacts for the headphones. For that I used copper tape.

    First I applied it on the top; then I did several cuts, spaced 1 centimeter each, and bent them to form an electrode in the lateral. It doesn't touch my head because the headband has a piece of foam.

  • 2
    Step 2

    To avoid problems with the polarity, I added a diode bridge. Unfortunately, that meant that the output voltage would be about 1.4 volts less that the input, so I also added a voltage regulator. This allowed me to use a 12 volts power supply while feeding 5 volts to the headphones charger.

  • 3
    Step 3

    The next step was to design a support where to hang the headphones with two electrodes that would make contact with the headband. I used FreeCAD for that.

    The file can be downloaded from the gitlab repository.