Electronic circuit

[Daniellagace]

I'm interest in your project but I don't find an electronic circuit for an 125khz antenna with an AS3933. Do you have one?

[LieBtrau]

I never finished this project because I realized later on that Bluetooth Low Energy is a better option for my application:

• greater range
• low power transmitter (versus lots of power needed for 125kHz signal generator)
• two way communication
• encrypted communication
• cheaper dev. modules (AS3933 is quite expensive)
• enables direct interaction with smartphone (as they have bluetooth built-in).

I think there's little application for this LF-technology. Maybe tire-pressure-monitoring systems (TPMS). What else? BTW, Digikey is discontinuing the AS3933.

If you want to persist in playing with the AS3933, I suggest you to have a look at the manual for the evaluation kit.

If you make your own PCB for the AS3933, I suggest to remain as close as possible to the original design. Don't repeat my mistakes.