Screaming Circuits: CAD Parts Libraries

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

Accursed Diode Marking

Am I a broken record? Pretty much - especially when it comes to confusing diode marketing. For example, everyone knows what the diode symbol looks like, and pretty much everyone knows which side is the anode and which is the... Read more

Fiducials and Odd PC Boards

One of the handy aspects of getting boards assembled at Screaming Circuits is that we don't require fiducial marks for standard process boards. I would say that we build far more boards without fiducials than with. That's cool, but there... Read more

USB Type-C Connectors

It wasn't terribly long ago that pretty much every cell phone came out with its own custom charging cable. It was a major step forward when they all (except Apple) standardized on the USB micro-B connector. However, there are a... Read more

The Common Parts Library

The two most common causes of delay in small volume manufacturing here at Screaming Circuits (and presumably, others like us) are component availability, and footprint mismatches. We don't substitute parts without your approval for a number of reasons. I've written... Read more

Those Danged LEDs again.

I fell into one of my own favorite traps last week: the dreaded LED footprint mess. I designed a board based on the Microchip PIC32 - it's a ChipKIT Arduino-compatible board - that has a number of RGB LEDs. on... Read more

Indicating Polarity On Diodes

Everyone knows which way current flows through a diode. Right? Of course they do. Diodes only allow current to flow in one direction. Well, sort of. In the case of your garden variety rectifier, barrier diode, or LED, that's true.... Read more

Using the Newest gen ARM, Part III

The continuing saga of the 0.4 mm pitch KL03 ARM microcontroller. If you haven't yet done so, read part I, and part II. Today, I have a look at the good, the bad, and the ugly - or more accurately,... Read more

USING THE NEWEST GEN ARM, Part II

I'm a bit behind in my blog work - well, way behind, actually. I started this series back in January with the intro post. Here's where I am right now: I have three different sets of PC boards. One set,... Read more

Component Footprint Rotation, Take II

I've noticed that a lot of CAD library footprints for two-pin polarized parts have pin one pointed up as zero degree rotation. According to IPC, pin 1 pointed to the left is zero degree rotation. Why is this such a... Read more

Component Footprint Rotation

Before we (or any old assembly house) go about putting surface mount parts on your board, we need to program our assembly robots. I'm oversimplifying, but essentially, the machine program needs to know the X / Y coordinates, relative to... Read more