NFC powered flashing fingernail sticker (with schematic)

This is a tiny little sticker designed to be stuck to a fingernail prior to covering it with nail art.
It then flashes with pulses of power received from the NFC (Near Field Communication) coil in the back of your phone. I'm not sure if they are intended to be used with an app that makes the NFC coil more active, but I wouldn't really want a random app like that on my phone anyway, for security reasons.

Note that subsequent closer examination showed that it has a second 12 turn coil on the back to effectively double the number of turns to 24.

These stickers can also be used to locate the position of the coil in your phone by shifting them about and noting the intensity. They may also be effective on the coils of NFC readers, but do not work with the classic RFID 250kHz readers or QI charger coils.

The circuitry is interesting in the way it uses a simple voltage doubler based on high speed diodes and capacitors.

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