Screaming Circuits: Engineer stories

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

IS IT VALUE? IS IT PROTO?

Looks like it to me. I got a couple of nice PCBs from Sunstone here. The parts, except for the Geiger tubes are here from Digi-Key too. The tubes are someplace between the Ukraine and Canby. All I have left... Read more

Check Again.

How do you know? How do you know what? It could be how do you know if that new restaurant has good food, or how do you know that the car you're about to buy isn't a lemon. It could... Read more

Fun With Electrolytics

I was fiddling with one of my robot boards the other day - popping some passives on and off and checking out subs and alternate values. I was doing this on a couple of boards at the same time. Everything... Read more

Loopy Ground Loops

A while back, I posed a question about using flood fill (AKA copper pours). I've been reading a lot about ground loops lately which brought me back to that original question. Some people suggest segmenting your ground plane between analog... Read more

Day two. Custom parts

Moving on from where I left off a few days ago... I was planning on using the PIC18F2320, but in poking around, I found that the PIC18F2321 is about $3.00 less expensive in small quantities. I'm not entirely sure why.... Read more

CAD This or CAD That

I use Eagle CAD a lot. I can get away with the "Light" version, because the designs I create are small and non-commercial. I do use them sometimes to illustrate points here on my blog, but I think that still... Read more

Grounded in Reality?

Looking back, I think I could have done a few things different. For example, I don't really need a separate power-on LED. I could either just not populate it, or rev the schematic a little to make it a software... Read more

That Final Check...

I'm not talking about the final check that you get from an employer laying you off due to outsourcing. That's a bummer of a final check. The final check I'm talking about is a good thing. It always pays to... Read more

Twitter, What is it Good For? Absolutely 555contest

I follow a few people on Twitter. A few people follow me on Twitter. A number of web sites have engaged their readers in debates about the usefulness of Twitter (and other social media) to engineers. In general, these debates... 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