1. The working principle is simple. It uses the current induced when swiping the card to power the chip and LED at the same time.
2. The LED and the chip are connected in parallel, and the LED package is 0603.
3. The chip has no positive and negative electrodes, so you can just solder them casually.
4. Pay attention to the front and back of the LED. Soldering it backwards will affect the normal operation of the chip.
5. If you only weld two lamps, you don't need to add a current limiting resistor, just short-circuit them. Try to choose the same color for the lamps.
6. The current limiting resistor is selected according to the LEDs of different colors, generally 100-500Ω.
7. Newbies who don’t know how to do it or have any other questions can join Q group 371248319 to solve it .
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