Author Archives: Duane

About Duane

Duane is the Web Marketing Manager for Screaming Circuits, an EMS company based in Canby, Oregon. He blogs regularly on matters ranging from circuit board design and assembly to general industry observations.

Manufacturability Index in Practice

My prior blog covered the Screaming Circuits Manufacturability Index. It’s something I’ll be using from time to time when discussing new components I run across. I’ve got a few examples to put the numbers into context. On the low side … Continue reading

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Component Manufacturability Index

Screaming Circuits’ Manufacturability Index Ranks the difficulty of assembling a component. Index is one to five, with one being easiest, and five being the most complex Sub index: a, b, c a: Not a challenge within the number rank b: Typical … Continue reading

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Mark Those Diodes!

Every now and then, I write about ambiguity with diode marking; like here, here, or here. It’s a pretty important subject to get right, but what does it have to do with Marco Polo, you ask? Well, that depends on whether … Continue reading

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Indicating Polarity on Diodes

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

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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, the … Continue reading

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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 PCBs. One set, I took … Continue reading

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Component Footprint Rotation, Part 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 … Continue reading

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Component Footprint Rotation

Before we (or any old assembly house) go about putting surface mount parts on a 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 the … Continue reading

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Using the Newest Gen Arm Microcontrollers

I’ve written a few times about the new Freescale KL03 ARM Cortex M0+ microcontroller. This particular part comes only in very small packages, with the smallest being a 1.6 x 2mm WLCSP (wafer level, chip scale package) 0.4mm pitch, 20 bump … Continue reading

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Polarized Non-Polarized Components: Inductors

We have a number of manufacturing engineers running around here at Screaming Circuits. They’re very good at what they do, as are our operators and technicians. They are not, however, electrical engineers. Our parent company has a big group of … Continue reading

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