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Design a simple LED circuit on a PCB. Place a resistor (R1, 330 ohm, 0805) and an LED (D1, 0805) on the front copper layer. Connect them with a track on F.Cu. The resistor limits current to the LED.
Design a PCB for an Arduino Nano driving 3 LEDs with current limiting resistors and proper power filtering. Route power with 0.5mm traces and signal with 0.25mm traces. Add a ground plane on the back copper layer.
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