01 — Teardrops
Smooth joints, fewer cracks.
A trace widens smoothly into a pad or via, forming a small copper bulge. The transition strengthens connections and reduces the risk of hairline cracking under flex, vibration, and thermal cycling.
A PCB is a million decisions compressed into a sheet of glass and metal. These eight are the ones that make the difference between a board that works and a board that lasts.
A trace widens smoothly into a pad or via, forming a small copper bulge. The transition strengthens connections and reduces the risk of hairline cracking under flex, vibration, and thermal cycling.
Power traces get wide copper regions to maintain stability, lower resistance, prevent voltage drop, and reduce heat buildup. Skinny power rails are how good silicon dies young.
Grounded copper areas improve EMI/EMC by providing a low-impedance path to ground and shielding sensitive signals from coupled noise.
Proper RF isolation, controlled impedance, and via guard surrounds prevent antenna detuning and noise interference. Antenna keep-outs are sacred.
Thermal vias are small plated holes that move heat from a component's thermal pad into larger copper planes — letting the inner layers do the work the package alone can't.
TVS diodes clamp voltage spikes in nanoseconds. Ferrite beads soak up induced noise. The board lives on benches, in cars, in pockets — and keeps booting.
Capacitors placed near an IC's power pins act as a local energy reservoir, stabilizing voltage during fast switching events. Distance kills decoupling.
Solid copper layers tied to ground create a low-impedance network that reduces noise and crosstalk. Everything fast on the board quietly leans on this layer.
"You can spot a careful PCB from across the room. It's not the silkscreen. It's the way the copper looks like it had a reason to be there."
See how these principles show up across 250+ shipped designs.