A PCB ruler is a common promotional item, or design exercise. Usually they have some sample outlines and holes as an aid to PCB design, but sometimes they also incorporate some circuitry. [Clovis ...

Like [Brad], we’ve seen a number of PCB rulers out there. [Brad] was looking to take the idea and run with it. His DigiRule is a ruler with a logic gate simulator. What he built is a mash-up between ...

It’s always good to get reader submissions on MbM, so thanks to Ian P for sending this one in. It’s a little “PCB ruler” that is embellished with markings to indicate trace width, a wire gauge chart ...