I’ve been using my running headphones with my newest phone for a while now. They are okay, but hurt my ears after a few hours. The most comfortable headphones I have are old Shure SRH440… which only have a wired connection.
I found a USB to 3.5mm audio adapter on AliExpress (apparently from BLUEKAKA):
https://a.aliexpress.com/_EvvyelY
I also needed a 3.5mm to 2.5mm audio cable, since the one from the headphones are a huge coiled affair designed to prevent kinks in the cable… great for recording in a studio but not very handy when walking the dog.
After hooking everything up it seems to work well. Yay!
Anyway, I was just carrying everything around loose until I realized that it was small enough to just strap onto the headphones. I used a hairband that my wife left lying around to attach the adapter.
It looks really janky, so I’ll probably 3D print a nicer looking setup eventually.
That looks Macgyvered as fuck, and i love it. I’ve done something similar before, but just temporarily and not attached to the headphones. I plugged my AKG K712 cans into my portable headphone amp, and that to a Bluetooth audio receiver. Then, had to have a power bank to run it all. It all fit into a Nintendo DS carrying case, but definitely not as convenient as having it attached to the cans.