2024-04-02 (Tu) SubdermalWirelessLEDs Planning new bracer

The last time I made a wearable arm brace to light my LEDs, I used a small coil. It was power-efficient, but the windings had to be close to the implant, or it would not work, spoiling the illusion. I bought larger coils for a second brace, but they run strongest at 24 volts. I connected a 4S battery with 22.2 volts, which powered up smoothly.
RC battery and coil

I was not keen on carrying a three-pound battery solely for the coil, but my USB power bank was PD-compatible, so it could output 20V. I added a PD trigger circuit and connected the coil, which I wrapped around my arm. My implanted LEDs turned on no matter where the coil sat.
USB PD and coil

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10

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