Sonos will only bring AirPlay 2 to its recent speakers | Circuit Breaker Parts

> those who haven had the opportunity to study electricity or had made the effort to study it. Can’t let Darwin wipe them out when they happens to the target market… Even worse is that there are people that want to build printers on their own, but are not qualified to wire stuff to line voltage safely.

The Residual Current Circuit Breaker is a tad expensive, and is probably overkill for most hobbyists. A Ground Fault Circuit Interrupter outlet, (GFCI), is cheaper to buy, cheaper to have installed, and a *knowledgeable* do-it-yourselfer can install his or her own. If you are knowledgeable about electrical wiring and codes, but don’t want to change an outlet in your house, you can buy a GFCI outlet and some regular outlets and make your own ground-fault-protected power bar, as a correctly wired GFCI outlet can protect additional regular (cheap) outlets as well. Alternatively, I’ve also seen GFCI units that plug in overtop of regular outlets and add protection to them.

While I found enough to quibble about to justify my role as a reviewer, I also found the Sony A55 and A33 to be uniquely compelling cameras. The most telling point was how hard I found it going back to an "ordinary" SLR after just a day of shooting with the A55. I’ve long been an avowed EVF-hater, but the viewfinder display on the Sony A55 is good enough that I found myself sorely missing it when I returned to shooting with a conventional sub-frame SLR with a typically small optical viewfinder. The Sony A55′s shooting speed matches that of professional models costing literally thousands of dollars more thanks to the unique pellicle mirror design, and its uniquely Sony features (Handheld Twilight/Multi-Frame NR and Sweep Panorama modes in particular) take the A55 places no other SLR has gone before. I was also pleasantly surprised by how comfortable the Sony A55′s grip was, given the tiny body size. I still prefer having more to wrap my fingers around, but this is as good a grip as I’ve seen on an SLR body this compact to date. While its primary target clearly is not the entry-level shooter, the Sony A55′s Auto+ mode takes it closer to true "just push the button" simplicity in auto mode than any other camera we’re aware of, enabling novice-level users to enjoy the multi-shot and other Scene modes without having to worry about which to use when. At the other end of the spectrum, for the enthusiast with time to become acquainted its capabilities and familiar with its quirks, the Sony A55 expands the realm of amateur photography further than any SLR to date. In the A55 and A33, Sony has used outside-the-box thinking to deliver a uniquely capable, functional, and well-designed SLR. Hot on the heels of their category-redefining NEX-3 and NEX-5, Sony’s engineers have now likewise redefined what consumers can expect from an SLR.

“Normal” mains voltage heating elements use nichrome (nickel chromium) some time called “resistance wire” because it has a higher resistance for a given surface area.

The issue with the DC heated beds seems slow temperature rise. Some bigger builds and beds need a quicker heatbed heater. (In my opinion not needed for PLA) Only for ABS.

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• A 24-V dc circuit • Current waveform for surge is 8 × 20 μs; voltage waveform is 1.2 × 50 μs (these are typical industry-standard waveforms) • Peak current during the surge = 1000 A • The MOV must be able to survive 40 surges • Other circuit components (control IC, etc.) must be rated to withstand 300 V maximum

They all have a ceramic rod or coil wrapped with nichrome wire that turn red hot. A vaccum forming table design I looked at used ceramic rods made the same way with reflectors to evenly distribute the heat. I believe all of the above (I did not verify if the table was) were UL marked.

And for example the max continuous current one is “rated” for is 20A, and when I calculated the values without any heat sink, I should be able to run about 700mA. A lot of people forget to do this step before de-rating.

the scariest thing I have ever seen/been around was in a fuel terminal at an oil refinery. I couldn’t figure out why we had printers, plotters, Apple II’s and monitors dropping like flies.

You are correct and if you design this type of solution you already know this. With PCB design, the alternatives are heavier copper, wider traces, plating up copper in the areas that carry heavy current or a combo of any of the three. But you can only go so far with these solutions. Hack apart a known good SSR and I bet they use the exact same solution.

I know some policies that clearly state work needs to be performed by “duly licensed” personnel (ie. you better be a licensed electrician or plumber). That’s one of the reasons I did not want to install my own automated transfer switch. Insurance company would possibly deny coverage in event of a mishap.