An insulating pattern applied to a printed circuit board that exposes only the areas to be soldered. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

The key element here is that copper and solder mask placements have extremely fine pitch. After placing the LEDs and resistors there’s a lot of blank space which was filled with what you might ...

Adding a solder mask might be one of those features for some, but if you happen to have a laser cutter and a few business cards sitting around then this process is within reach of the home builder ...