Screaming Circuits: Layout

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

Fiddling with Fiducials again

I recently posted a note about fiducials but I didn't have any images. Here's a couple of examples: This first example shows what IPC would like to see. If this is an individual board, this would be it. If it... Read more

Is it your fiduciary duty to use fiducials?

We don't require fiducials here. It's not mandatory. That's because we live in a prototype world and in that world, theory doesn't always match up with reality. That being said, there are things we can do and things we would... Read more

Ambiguity

It's pretty important to have unambiguous polarity markings and pin one markings printed on your PCB. In theory, for SMT parts, it really shouldn't matter; the centroid would take care of the placement orientation. But, you may have noticed that... Read more

More CAD footprint woes

AT this point, I really shouldn't call them "woes." More like business as usual. I'm talking about the need to make custom footprints, or at leas modify footprints. Back in the old days, the only thing needed to make footprints... Read more

Shrouded vs. non-shrouded

A connector isn't a connector isn't a connector. In this photo, the original PC board was designed to have an unshrouded break-away header, as shown in the inset on the right. I measured it. The entire header fits within the... Read more

QFN Solder Paste Layer

I've got the fab order placed with Sunstone.com for my next demo project. The little board is represented here at pretty close to actual size on screen - provided you have a 22" monitor set at 1680 pixel horizontal resolution.... Read more

Particle Update

I've been ignoring my Geiger counter for a while now, but I picked it back up and made some progress again. For some reason, I just wasn't getting the 555 based HV power supply to generate a high enough voltage.... Read more

Let's Get Small - 0.3mm pitch BGA

I recently got an email from Practical Components about their new 0.3mm pitch evaluation board and dummy 0.3mm pitch BGA. Now, we've been assembling 0.5mm and 0.4mm pitch BGAs for years. Those sizes are kind of not really anything special... Read more

Thru-hole to SMT

Thanks to a comment from Michael yesterday, I think everything is now cool with my Geiger counter. I had left the AT2313 default fuse setting at clock/8. That dropped the RS232 speed from 9600 to 1200 and it made the... Read more

Geiger Counter without the Muller?

My Geiger counter project has been on holiday for a while. When I originally ordered all of the parts, I ordered fuse clips (to hold the tube) with solder lugs too big to fit in the holes and a trim... Read more