Screaming Circuits: Tips and tools


V-Score panelization

My last post talked a bit about panelization, in general. Today, I'm taking a look at V-Score panelization. V-score is created by running a V-shaped blade across the top and bottom of the panel without cutting all the way through.... Read more

PCB Panel Routing Technique

Most PCBs we receive are individually routed, i.e., not panelized. That doesn't mean that, sometimes, sending them in a panel isn't a good idea, or required. Generally, we don't require panels (sometimes called a pallet), but there are some cases... Read more

VLV - Very Large Vias

I recently received a question over on Twitter. Tomaž Šolc, AKA avian2 asked: "@pcbassembly What is your opinion on the "one big plated drill in QFN ground pad" pattern?" I answered back: "Bad for machine assembly, okay for hand... Read more

Pads on Ground Plane

Generally, small pads for passive parts are connected with a single PCB trace of equal size to each pad. That's the right way to do it. However, sometimes, circumstances dictate a little different approach. The illustration on the upper right... Read more

10th Anniversary Top 10 Traps

A few folks requested my presentation from out 10th anniversary open house.So, without much adieu, here it is. Download Top 10 traps 7-2013 (PowerPoint format) Download Top 10 traps 7-2013 (PDF format) Duane Benson 10 times 10 isn't necessarily equal... Read more

Super Small Via In Pad

Via in pad is an old issue that still pops up now and then. Our standard answer hasn't changed: No open vias in pads. But one of the questions we get related to the subject is: "What if we make... Read more

Push-me Pull-you LEDs

I may never get tired of talking about LED and diode polarities. It's so much fun. Not long ago, I wrote about two LEDs from the same manufacturer, marked with opposite polarities. I recently ran into another one, but at... Read more

LEDs - Seeing Double

Like I do so often, I'm being a bit redundant. While I'm all for stamping out and eliminating redundancy, this is redundancy with a purpose (not a porpoise). Not long ago, in a galaxy not far away, I blogged about... Read more

Creating a QFN Footprint - the center pad

I've written bits and pieces about creating footprints in Eagle and a lot about what the QFN solder paste layer should look like, so maybe it's time to connect the two dots. I'm using Eagle CAD here, so your process... Read more

Will a Via Fit Between?

I don't know that it would be accurate to say that BGA's have ever been easy, but with 0.4mm pitch being common and 0.3mm pitch showing up, some of the older size, like a WHOLE millimeter pitch seem positively spacious.... Read more