Not everyone knows what a PCB designer does. Most people just see the finished green board inside their gadgets and move on. But behind every one of those boards is someone who spent hours — sometimes days — thinking about traces, footprints, stackups, and clearances.

Let's talk about that.

A PCB (Printed Circuit Board) designer is the person who takes an electrical schematic — a logical diagram of how components connect — and turns it into a physical board that can actually be manufactured. It's the bridge between "this circuit works on paper" and "this circuit works in the real world."

It sounds straightforward. It is not.

You start with a netlist from the schematic. Then you place components — and placement is everything. Power components near their decoupling caps. High-speed signals away from noisy rails. Thermal considerations for anything that runs hot. Mechanical constraints from the enclosure. Connector positions that make sense for the end user.

Then comes routing. Signals need to go from point A to point B, but they can't cross, can't be too long, can't run parallel to the wrong neighbor, and can't violate impedance requirements. On multi-layer boards, you're managing a 3D puzzle — signal layers, power planes, ground planes — each with its own rules.

And then there's the DRC. Design Rule Check. The software tells you everything you did wrong. You fix it. Run DRC again. Fix more. Repeat.

Everyone focuses on the tools — KiCad, Altium, Eagle, OrCAD. But the real skill is engineering judgment.

Knowing why a 50-ohm trace needs to be a specific width on a specific stackup. Knowing when to use a pour vs. a plane. Knowing how EMI will behave around a switching regulator. Knowing what the manufacturer can and can't actually produce at the tolerances you're specifying.

That kind of knowledge takes years to build. You learn a lot of it by getting boards back that don't work the way you expected.

There's something deeply satisfying about holding a board you designed. You laid out every trace. You chose where every component sits. You sweated over the stackup and the impedance calculator and the courtyard clearances.

And now it powers on. And it works.

That moment never gets old.

The Hard Parts
Deadlines. Schematic errors you only find during layout. Last-minute component changes because of supply chain issues. Footprints that don't match the datasheet. Manufacturers pushing back on your design files. Revisions after revisions.

PCB design is a craft that lives at the intersection of electrical engineering, physics, and manufacturing reality. It rewards patience and punishes shortcuts.

Absolutely. If you enjoy problem-solving, care about how things are physically built, and find satisfaction in tight, clean layouts — PCB design is one of the most rewarding technical disciplines out there.

Every device around you has one. Someone designed it. That could be you.

26 May 2025
Potato Codex