How to identify payment card chip model?

[typk]

@Az_F

Antenna (inductor) inductance, chip (capacitor) capacitance and resonant frequency (NFC) are linked. It’s called an LC circuit LC circuit - Wikipedia
You can easily get one parameter from the other two

Thank you!

@Satur9

Hey, I can help. For background you can check out this thread where I’ve compiled background info about making antennas. After this chat I’ll probably add a post explaining how to make repeater antennas for CoM modules.

Thanks so much for the information. I have taken a look and I have a mix of chips. I have a picture of a couple here form old cards and a CoM chip. Ill probably make this a project to build my understanding.

Where I have circled is where the original antenna was fixed so my theory was that I could just solder a new new one, or I could get a PCB made up with some sort of semi liquid solder to bridge the connection and just glue the rest of the chip.

@Satur9

If that’s the path you choose, and you want more detailed information about how to do it, let me know and I’ll make a post about it in that thread and ping you.

I also have a CoM module I am interested in so please do make a post and ping me. Thank you!

Edit: In TagInfo which section specifies the UID?