Build a better RGB LED controller.

Step 2 The diode.

Now comes the diode. This is a polarity sensitive device that limits the direction electricity can flow. It's function in this kit is to protect the circuitry from damage if power is applied to the unit with the wrong polarity.

The diode has a band round one end and should be inserted into the PCB so that it matches the graphic.

The module can use just about any diode in the 1N400X range.