NFC Range extender

And here it is

Remember the caveat

Arrived a few of days ago, happy with that

As some people may be aware, I carry a T5577 card in my phone case
Seperately, I also made a Range extender and carried that inside my case

But that was too much crap in my phone case, So my idea was to get a 2in1 Card


Identify the location of the chips and antennas

( In my experience, HF Coils tend to run the premiter in a retangular fashion, and LF Circular and central )



Next, Fill a glass vial with acetone, and make a hotglue seal around the neck over the HF chip, flip upside down to soak the plastic in the targetted location.
Place the contraption on a galss platform ( so the acetone doesn’t eat through the surface it is sitting on )

Let soak for a couple of hours

Let soak a couple more

Check the underside for signs of it losing the battle


Peel away the hot glue and peel off the soft melted plastic from the card.

I SHOULD HAVE TAKEN A PHOTO OF THE CHIP BEFORE I REMOVED IT

Oh well :man_shrugging:


Desolder the chip and replace with a 22pf capicator
Why 22pf


Strip wire enamel with soldering iron, and Solder said capicitor to the antenna wire

Fill the void with hot glue

Test
Phone (Samsung S21+)
Reading a full sized DF2 card
Without Extender= 35mm
With Extender = 42mm

Was it worth it? Probably not, But It may help some people if your phone is struggling to read your implant.

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Im sure somebody will ask.

Range on implants?!

Difficult to measure accurately, but heres my best approximation (and though phone case)

NExT
Without Extender= Contact
With Extender = ~5-6mm

FlexM1 gen2
Without Extender= 5mm
With Extender = ~-10mm

In reality, the range is irrelevant as I just always touch my phone to my implants, BUT, they are noticibly easier to read

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Nice. Did something similar at Resonant Repeater Stickers - #101 by StarGate01 , works great.

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This really doesn’t look too hard to do.
Gonna order some Acetone.

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And also @Azflyer

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