Screaming Circuits: Engineer stories

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

To Mod or Not to Mod? That is The Question

Many years ago, I was a product manager at a business-consumer electronics company developing some pretty leading edge display equipment. Prototyping back then was a long and painful process. A PC board might take a month or two to arrive... Read more

"Shrinky Dink"

I had some "Shrinky Dinks" when I was a kid. Amazingly you can still buy them. You can also use that concept in your prototyping. I did that recently. I have a robot board design that I'd like to shrink... 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

Embedded at the Airport

I'm traveling to Phoenix today. Or, allegedly, I'm traveling to Phoenix today. The plan was to drop in to the office, do some work and print some things out for the trip, which I did. Then off to the airport.... Read more

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