NFC antenna amplifier/Resonance Circuit project

[Pilgrimsmaster]

@Hamspiced

So reading back on the forums here I saw someone that just grabbed an NFC fob, ripped the old chip out and added a capacitor.

There are a few examples

Extended nfc range on phone, scan a flexNeXT through hand!

Opened up my phone today to add a wireless charging board and played around with adding the mod inside the case, directly on the antenna. It works alright so I left it inside [P_20200729_143451_1]

Resonant Repeater Stickers

I made a simple repeater by repurposing the antenna of a comemrcial NFC NDEF keyfob. Cut away the MOB chip and replaced it with a 22pF capacitor. I measured the resonant frequency using a NanoVNA, and I got close enough (peak at 13.9 MHz). Taped it to the back of my phone (the case hides it), and it improves the read performance of my Flex quite a bit. [signal-2022-11-07-155701]

Homemade NFC range extender

Following this post, I figured I’d leave this here in a separate thread if someone wants to make one for themselves, since it is generally useful for all kinds of purposes. A NFC range extender is a bit of a misnomer. It extends the range as in “you can read a tag some distance away from the reader / cellphone” or as in “the tag you read at the other end can be read better or farther away than directly with the cellphone”. This little homebrew gadget does the former without even trying very har…

Haha, and mine looks the shittiest

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 [Screenshot_20230119_192607_Viber] But that was too much crap in my phone case, So my idea was to get a 2in1 Card [927945339974095906] Identify the location of the chips and antennas ( In my experience, HF Coils tend to run the premiter in a retangular fashion, and LF C…