Mastodon post with no text and an image showing a Monobank card strapped to the back of a Pinephone with some rubber bands. The text within the image reads "Contactless payments on PinePhone (working Google Pay/Apple Pay alternative)".
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[–] 25 points 3 months ago (7 children)

I dissolved the card in acetone to extract the NFC chip and its antenna,

Wouldn't the acetone also dissolve the insulation around the antenna wire? So when it touches itself, it shorts itself out, and -- electrically speaking -- you only have one turn of thicker wire?

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  • [–] 19 points 3 months ago (3 children)

    Only one way to find out, good thing that these don't cost any money and you can just ask for a new one.

    Maybe take some cash out first to cover any payments you may need to make it it breaks in some way.

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  • [–] 7 points 3 months ago (2 children)

    If OP is using it and is happy with it, maybe one turn of wire is enough for it to still work, maybe with reduced range?

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  • [–] 17 points 3 months ago

    My guess is it wouldn't work. On a magnetic antenna, the number of turns don't affect range, but they do affect the frequency to which the antenna is tuned. It needs to be tuned roughly to the frequency the protocol operates on, otherwise it won't work. In addition to that, these antennas also need to pick up power, which is also relative to the number of turns.

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  • [–] 12 points 3 months ago*

    Well if it dissolved any insulation, it will not work, as the coil isnt even coiling. It is not a one big coil buy just two ends of antenna shorted(or as in the picture, a very small coil. Since this works i can only conclude coating does not dissolve in acetone

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