Screaming Circuits: August 2010

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

Via-In-Paste

I've heard of vias in pads, but vias in paste aren't so common. Here's a QFP footprint with a lot of thermal vias in the center pad area. I'm guessing all of those vias are necessary for heat removal, but... Read more

Modularity and Standards

Eons ago, (well, it seems like eons) when IBM designed its original PC, it took note of the success of the Apple II with it's modular expansion system - easily accessible card slots with loads of clear documentation - and... Read more

The Top Ten Generic Things

I'm in a bit of a ranting mood right now. That just happens sometimes. Usually it's on a specific subject, but today, I seem to have mini-rants about a whole bunch of things. Well, maybe ten things. So here they... Read more

What, what, what?

Quick. Pretend this is the footprint for a diode. Which way does the cathode face? Okay, if you can't figure out which side gets the cathode, how about the anode. Which side does it go on? Hah! It's a trick... Read more

Updated Centroid Documentation

A little housecleaning is usually a good thing. Here at Screaming Circuits, we try to be as flexible as possible and we'll do a lot of different things - standard and non-standard. But we really should, when passing on documentation,... Read more

Mask Control

I wonder. Is solder mask difficult to control in most CAD packages? Or do we just not need to control it very often so we forget? Take this little footprint here. It looks like someone just used a little flood... Read more

All Leadless

It wasn't too terribly long ago that just about any design could still be built all thru-hole. Okay, maybe it was a little longer ago than that. Once the big CPU chips stopped showing up in PGA (pin grid array),... Read more

Global Shifting

Friday morning, I walked my way to the office in a slight drizzle. It was overcast and cool in the morning, eventually warming to near August temperatures later in the day. We had a long, mild winter, a long, cool... Read more

Does Angle Matter

It's standard practice to avoid joining small PCB traces at 90 degrees, but instead to join them at an angle. But, does it matter for thick traces? Here's some 20 or 24 mil traces. Is it really going to matter,... Read more

« July 2010 | Main | September 2010 »