On Mon, 18 May 2020 01:55:29 -0700, Mike S wrote:

I have a pair of Even H3 headphones, the wire that carries power from
one earcup circuit board (where the battery and USB connector live) to
the other earcup (where the control and sound circuitry live) shorts to
ground somewhere in the headband. I can't find parts for this thing so I
am going to run my own wire to replace the faulty one. What kind of wire
is recommended for this kind of use, where the earcups swivel, tilt,
rotate, etc.? I have solid core multi-strand wire I can peel from a
ribbon cable, but I'm concerned that the metal will fatigue and break at
the bend points.

Check if the wire is a single insulated wire, two insulated wires
twisted to gether, or shielded coaxial cable.

Ribbon cable is probably to large and stiff. Instead, I suggest
disassembling an audio phono cable, mouse cable, or computer serial
cable for suitable wire.

This might help:
"Soldering Headphones And Enamel Wire"
https://hackaday.com/2016/11/22/iron-tips-soldering-headphones-and-enamel-wire/

If you end up with something that is difficult to solder, try wrapping
one strand of fine wire around the end of the wire and tin it with as
little solder as possible. That should be both stronger and easier to
handle.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558