Button-Fade PCB




The resistors (220R) and push button have no +/- pins because they are non-polar.

The LED, capacitor (10uF), and diode (1N4001) all have markings on the negative pin, which always goes in the square hole on the PCB.

The NPN transistor (2N3904) has one flat side to indicate direction. Use the PCB diagram to ensure the flat side is in the correct orientation.