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I had this smart ring from a company called Oura, and I took my charger apart recently. Inside, I found an incredibly small inductive charging coil printed inside of a little FPC.

Could anyone identify where one might acquire such a component? I have tried Googling various markings on the PCB and the little FPC coil, but to no avail. I can't even get the "S" logo to yield anything interesting in reverse image searches. Any help would be appreciated.

FPC coil:

PCB top:

PCB bottom:

David Moore
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  • I'm pretty sure that's custom-made. (There may be over-stock suppliers, though. I wouldn't know.) Do you think it's off-the-shelf for some reason? – jonk Aug 23 '21 at 04:42
  • It just looks like a custom PCB- the markings (backwards UR and 94V-0 flammability rating) are typical. So you'd draw exactly what you want in a suitable program such as Kicad or Altium and have it manufactured. The stylized S appears on both PCBs - maybe the PCB maker (of which there are thousands) or another company common to both. – Spehro Pefhany Aug 23 '21 at 04:49
  • Also suspect it's a custom flex board. See the board below, there is also 'S' logo and bard version 'STD-1'. So it make sense the flex board coded similar as 'STF-3'. – diverger May 07 '22 at 18:54

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