Blog - Screaming Circuits

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

The Ideal Bill of Materials

A good portion of a quality build is simply the result of clear information. One of the more important pieces of information we deal with is the Bill of materials, called “the BOM.” The BOM is a list of all... Read more

Last Minute DFM - Are You In Portland, October 4th?

Learn about last minute DFM, and enter to win... In a prototype world, with competition breathing down your neck, you need everything to work, work fast, and work the first time. Sit in on my "Last Minute DFM" class to... Read more

Mistakes Were Made - Too Much Ground Isolation

I recently ran a batch of my Neo Pixel clock boards through the factory here. It's an Arduino UNO-based design that I made for myself not long ago. It sports an Atmega328P, with bootloader, an FT231X USB chip, and a... Read more

QFN Center Pad revisited

The QFN (quad flat pack, no leads) package can no longer be considered exotic. It was when I first wrote about it a decade ago, but not any more. In fact, with the wafer scale BGA, it's one of the... Read more

Out of Ideas and applied Heisenberg

Every now and then, most of us seem to run out of ideas. Then, like the proverbial high school term paper, with a subject requirement of: “Pick a subject you’re interested in”, we struggle to come up with what to... Read more

Eclipse-o-pocalypse 2017

Save the date: August 21, 2017. I don't need to tell you what's happening that day, but I will anyway. It's total eclipse day here in the USA. I wouldn't care too much, except; a) I think total eclipses are... Read more

Never Take Pin Numbering For Granted

Our all-things-about-electronics manufacturing standards body, the IPC, specifies the proper numbering order for most components. That's a pretty nice thing that they do there, but it's not always enough to prevent layout mishaps. Case in point a line of small... Read more

Components So Fragile, They Break Before Arrival

There are a lot of components that require special handling. Some days, "special" requirements seem more the norm than the exception. But, every now and then, we see something that puts even those special components to shame. Not long ago,... Read more

What's So Difficult About Diodes?

A diode can be put on a a PC board in one of two ways. It's only got two pins (usually - see, already, Iv'e got a caveat.) I've written about them a few times before. I've got a sampling... Read more

What Makes a Good Fiducial?

Accountants may have a fiduciary responsibility, but that really has nothing to do with PC board assembly. Change the "ry" to a "ls", however, and you get fiducials, which does have something to do with PCB assembly. A fiducial is... Read more