Constellation Performance Centaur II 500 power amplifier | Lrd12 Overload Relay

Quite often, when I was in the Air Force as a Cable Dawg, I would get zapped while doing copper cable cut splices for mission critical systems. Meaning they were left powered and came back on one by one as they were spliced. -48v DC is very tingly when it runs through a crimper and into your arm…

The best defense is to make sure you buy from reputable sources, not from some backyard hardware store or eBay.

Gardner Minshew II threw two touchdown passes and ran for another score and No. 12 Washington State stopped No. 25…

I have never understood why North America stayed in their stupid 120V system, that uses very high currents over inferior aluminium wires, connected with lose screwcaps and fuses that may explode out of the wall. And it would be probably federal crime and against the code to use proper copper wires connected with good push lock blocks and DIN rail mounted fuses and contactors…

You completely missed the point. The safety regulatory doesn’t change regardless of the *perception* or the *knowledge* of the person using it. If you are selling a product or publishing a design, you may ended up being liable for the end users. Even if you are the person that design and build your own stuff, plugging in something not certified pretty much voids your home insurance if it happens to be the cause of a fire etc. On the other hand if you are playing with ELV from UL etc approved/certified supplies, you are covered.

Semiconductors can fail, and when they do, they often fail in ways that make conduction paths that otherwise should not exist. Mix that with high voltage power and you’ve got a recipe for disaster.

Theres a homebrew 80vdc @150amp supply in my cnc converted bridgeport, that runs the entire dc rail for the steppers and other stuff, its always scared me slightly because I know that the big transformer its based on has a mag field and when it collapses and it has some massive smoothing capacitors to boot, so I have masses of isolation distance everywhere the dc side runs and I disable the transformer with a dedicated switch while working in the cabinet of it. I had a stepper driver supplied directly off the rail go bad and it just had a large hole where it used to be. I just imagine that was a bit of me if I get tempted to get sloppy with it. I’ve never put much thought into getting electrocuted by a welder, I’ve tickled my finger with my 3 phase tig set more than a few times getting too close and giving a nice easy starting path to the startup pulse. Maybe I should, I’ve got a massive 3 phase 380v transformer tig that can do 375amp dc, that tends to throw all the breakers out while its saturating its massive transformer with the inrush current… I try to treat mains voltage with the respsect it deserves. Its a killer, but if you take sensible precautions and steps you can avoid it being you it happens to.

It’s possible to use solar power to charge an EV, usually via panels mounted to the garage roof, but this can cost upwards of $7,000 per installation. And that doesn’t include having a storage battery installed to capture power during daylight hours for overnight charging, which could double the cost.

Flake, along with Sens. Chris Coons (D-DE) and Cory Booker (D-NJ), attempted for the second time to schedule a floor vote on the bill protecting Mueller on Wednesday, but it was blocked by Sen. Mike Lee, who argued that the legislation was unconstitutional (a longstanding conservative argument, explained by Vox’s Tara Golshan here). The bill would ensure that Mueller could only be fired by a Senate-confirmed DOJ official and enable the special counsel to review any firing.

I stuck a finger in a light socket when I was about 3 years old back in Brooklyn NY and got a momentary buzz sensation. Nothing more. I got a few more 110V shocks as a US Army Air Force student of electronics back in 1944. No problems but I was warned to keep my left hand in my pocket in uncertain situations to not form a circuit through my heart, Here in Helsinki where I now live I have taken 220 V a couple of times. Nothing I’d recommend but no harm done. Nevertheless, I’m careful and never fool around with wet hands.

It’s what this high technology allows that’s so exciting: real-time, phase-detect autofocus while firing off up to seven 14-megapixel frames per second in the A33, and ten 16-megapixel images per second in the A55. Few other large-sensor cameras offer frame rates this fast. DSLRs rivalling the A33′s speed are available for a little over $1,500, while only professional cameras that cost around $5,000 can match the speed of the A55 — and they’re still not capable of real-time autofocus between shots like the new Sony Alpha SLT cameras. Real-time phase-detect autofocus is also constantly available in Movie mode, something no current SLR can achieve.

At the risk of being labeled a pedant, I’ll remind you that Mike isn’t billed for power, he’s billed for energy, and you didn’t say how *long* you’d expect to draw 3 kW for free.