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Mar 4, 2019 at 14:12 comment added KalleMP There were a few isolation amplifier hybrids that used capacitive power transfer some time in the past. This would eliminate the transformation component for OP.
Mar 4, 2019 at 9:58 vote accept Tamir Amitai
Feb 28, 2019 at 14:06 comment added Rokta Another "solution" would be DC motor and DC generator, with same problems as LED +some others.
Feb 28, 2019 at 13:01 comment added Finbarr I did think of the LED-solar panel route but that would hurt his BOM cost even more and take up way more space than a transformer!
Feb 28, 2019 at 12:59 history edited Bimpelrekkie CC BY-SA 4.0
added 395 characters in body
Feb 28, 2019 at 12:39 history answered Bimpelrekkie CC BY-SA 4.0