NFC antenna amplifier/Resonance Circuit project

Alright alright, flipper time


I know it’s supposed to be glued on the case, but the adhesive cannot hold on to the silicone.

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Got some repeaters from Hamspiced and am blown away by how much it helps out!
I have gotten my front door’s Schlage to scan my xMagic just a few times in awkward angles that are impossible with the door shut. Probably 4 times it has scanned successfully with over an hour of trying to mess with it. (Side note for the vid, I tried changing the batteries to help with reading to no avail, and now it has a long loud beep that you hear in the vid.) Now I can get consistent reads and I don’t have to mess with positioning! Now I just need to talk to the leasing office about placing one on the other doors and gates and I can ditch the key fob!
I also placed one on my phone to help with consistent reads and the positioning time as decreased dramatically. I’ve kind of gone back to week 1 with an xSIID and just playing around with the led since it’s so much easier now haha
Thank you @Hamspiced!!

Video showing the sweet spot finder not lighting up until the resonance circuit is placed behind it:


Resonance circuit placed on my phone’s sweet spot. The sweet spot locator works really well!

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Would they know it was you if you just placed them there anyways? Im of the ask for forgiveness before permission type with unobtrusive things that only benefit others.

What phone is that?

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I think I’d draw the line there actually dude… For a thing with weird coils that has your logo/link on it to just start showing up on door locks may make people suspicious “OMG people are trying to hack into the doors!”

If you had some without the logo, then it’s just a weird black sticker.

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Yeah i will likely do a run of blank ones like the RSP. The problem is i dont want people to think its intentionally inconspicuous and nefarious. At least they would be able to look it up and see what it is…

To Be Fair, as it is now to an untrained eye it is just a weird black sticker with a goofy design on it.

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Yeah, true enough.

But I’ve had somebody threaten to call the cops on me because I “Took too long trying to open the front door and looked suspiciously like I was trying to break into it”

It’s like lady settle down… I have 8 keys on this ring for the building and they all look the same just gimme a sec.

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It’s a Galaxy S24+
They already know about the implants and my plan to use them when I moved in. I’ve talked with them about the current readers on site and they have expressed interest in replacing them with some that aren’t a PITA for them and the residents. I was thinking about putting them under the covers on the readers that way the other residents don’t get worried, and it doesn’t look like graffiti for prospective residents doing tours. So I’ll see where they are in regards to replacing the readers, then ask about placing the stickers. I’m sure they’ll be fine with it, just want to work with them since they’ve been really nice and have worked with me on other stuff.
I did slap one right on the outside of my front door though because the logo does look slick! And I already got lucky putting the lock back together once lol

Edit: and there are cameras all over the place, don’t want them asking me why I went around messing with the readers XD

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Oh completely fair.

I actually did a test a couple weeks ago to see if there is any solvant to remove the silkscreening. Unfortunately there isnt. However it does scrape off really easy with an X-acto knife.

Gonna add it to the Wiki

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I found this while looking to post in the Phone NfC Performance wiki if it would help your wiki as well.


Edit: red/brown rectangle is sweet spot for x series implants, and also for the repeater.

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i have that site that has all the phones and antennae positions in the first post of the wiki.

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Received my stickers a few weeks ago.
Have only tested them with elechouse PN532.
I usually can get a read on my xSIID over 4 or 5 mm.

The v3 flex stickers give me good reads through a 25mm MDF tabletop.
The giant one goes through my front door without any problem.

This opens up so many possibilities for renter friendly NFC locks!

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Holy crap it goes through a front entry door? That is way outside what i thought it could do.

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The door is wooden and a little over 4cm thick.
If your door is thicker or has metal inside, then ofc results may vary.

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Try v2.1L you will be surprised what it can do

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I honesty never even considered trying to go through my entry door (also wooden). I just assumed it wouldnt work.

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Depends a lot on the reader too… never forget performance is a dance between many partners :slight_smile:

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Ive made edits to the V2.1S it is now Versioned V2.2S. These edits are more for me than the community so no need to try to replace them. Just letting everyone know if you purchase any and see the version change that it doesnt impact performance at all.

When i do a run i test each unit and grade its performance. i toss any that are outside what i feel is acceptable. With the V2.1s i had around a 20% loss due to the variability of the smd capacitors that are used. So i adjusted the antenna to account for it and i have brought the loss down to about 2%. So like i said, it doesnt affect range or performance on your end just ensures the production runs are more efficient on my end.

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As one of those partners all I have to say is

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It’s a middle school dance where everyone wants to socialize but are bashful

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