Unsolicited

I have a question for you. When is the last time that you responded to an unsolicited email? It's been a very long time for me. However, I just did open up and read an unsolicited email that actually seems somewhat relevant to me. The specific subject was an offer to be a guest blogger here on blog.screamingcircuits.com. I don't know that I'll take them up on the offer. It kind of depends on what they might want to write about.

But I did jump over to their website: www.circuitspecialists.com. I've never done business with them, but they do have some interesting products and they started in a garage in 1971. Anyone who started in a garage 40+ years ago and is still around must be doing something right. Their site looks like it's more or less focused on test & measurement, prototyping, robotics and other things electronic. (I think I've heard the term "prototyping" someplace...).

What first caught my eye as relevant was their section on digital panel meters. Why would that catch my eye, you might ask? (Or you might not) The first panel meter I looked at is an "independent power supply version." Ah, the plot thickens. Just last weekend, I exploded a power supply in a robot I'm building. It didn't actually explode, but it certainly did release smoke and stopped releasing electrons at about the same time. Smoke for electrons is not  a fair trade as far as I'm concerned.

I was putting a digital Ammeter on the main power line and couldn't remember if it the meter was designed for high side or low side. Poof! I empirically determined that it was designed for low side. I should have known better because it drew power from the robot power supply without any isolation.

If my meter had an isolated or independent power supply, then I could probably have put it on the high side. Oh well. It wasn't the first time I've traded smoke for electrons, nor will it likely be the last.

Duane Benson
rhythm characterized by regular recurrence of a systematic arrangement of basic patterns in larger figures

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