Carrying four cards every time you go out is too troublesome. Now, you only need to carry a quad-in-one PCB card to perfectly solve the problem of carrying too many cards.

Physical Simulation Diagram

The design of the entire card is simple. The front features a four-position DIP switch for controlling the card switching. There are two LED lights on the小人, which light up when swiping the card. The back has four IC card chips.

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Circuit Diagram

Next, let’s take a look at the circuit design. The size of this card is strictly made according to the size of a standard IC card. When ordering PCBs, you can choose a thinner board to make the texture more similar to that of a regular card. The upper right corner is a DIP switch, responsible for connecting the coil and the chip. When you open the DIP switch, the chip on this circuit connects to the coil and reads the corresponding chip data. Below the switch is a surface-mount resistor, which supplies power to the LED lights. The resistor prevents the lights from drawing too much power, which could affect the chip’s performance. As I mentioned earlier.