他们逼我做卧底

PCB keychain

Overview

I simply designed a PCB keychain with a coil inside. When it is close to the card reader, the LED light will light up. Please note that the LEDs must be soldered in the same direction.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-22 19:35:37

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