Varistors, also called metal-oxide varistors (MOVs), are used to protect sensitive circuits from a variety of overvoltage conditions. Essentially, these voltage-dependent, nonlinear devices have electrical characteristics similar to back-to- back Zener diodes.
You don’t need a 3D printer to use a heated print bed for 3D printing? I’d think that having the rest of the 3D printer would more or less be required to use a heated bed to facilitate printing.
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For the person who jumps up and says “coatings insulate the water from the trace”, well no it doesn’t, we are talking about AC voltages and water that has formed over a large trace (even insulated) forms a capacitor that will conduct AC even when you have a DC insulation. Even if it did you then still have the exposed solder pads.
Sonos also made another big promise last October: Google Assistant. The company has positioned the Sonos One as a smart speaker that will be assistant-agnostic and support multiple consumer favorites. It shipped with Alexa, AirPlay 2 will cover Siri (albeit from your iOS device and not the speaker itself), but Sonos hasn’t provided much of a status update on where the Google project is.
Look and feel. Although it lacks the reflex mirror of an SLR, having replaced it with a fixed translucent mirror, the basic shape of the Sony SLT-A33 still follows that of a traditional SLR fairly closely. That’s because, since it accepts the same Alpha lenses as Sony’s DSLRs, the Sony A33 also has to accommodate the same backfocus distance, which is one of the main contributors to the size — and especially, the depth — of an SLR camera. Removing the reflex mirror still provides potential for space and weight savings, and Sony has taken good advantage of this. Most obviously, the drive mechanism that raises and lowers the reflex mirror in a traditional SLR isn’t needed. The translucent mirror design also provides other opportunities to optimize component placement. As one example of this, Sony has increased the angle of the translucent mirror, so that instead of directing light directly upward at a 90 degree angle as it would for a viewfinder prism, it is actually angled upward and slightly forward, allowing the autofocus sensor to be moved forward, providing more room for the electronic viewfinder assembly directly to the rear.
I think *local* distribution of DC makes some sense. We have too many wall warts in our houses. Standardized 12 volt DC power with a whole-house supply would be far more efficient. Of course, it’s not going to be commonplace in even my children’s lifetime, but…
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A clean filter is vital to a well-functioning air conditioner. During the summer it is good to check your filters once a month. If you have pets, leave windows and doors open, or have allergies, you may need to change your filter more often.
Rather than rest after establishing products in every major sector of the interchangeable lens digital camera market — APS-C SLR, full-frame SLR, and most recently single-lens direct view — Sony is boldly striking out to create yet another category with the launch of its very first translucent mirror cameras. The main goal of the new design: achieving unprecedented autofocus and capture speed from an APS-C sensor, interchangeable-lens, consumer digital camera. Comprising a new SLT series, the Sony Alpha SLT-A33, A55, and A55V are closely related cameras sharing the same basic design, with only a few internal features as major differences.
As an engineer over 20 years ago I coined the term Beancounter Engineering this kind of stuff where some Idiot MBA sets the specs based on saving a few pennies rather than a Electrical Engineer that understands basic (and complex) science. If you are too damned stupid to understand the basic science behind Global Warming you have no business being an engineer or telling engineers what to do
Ive had a few shocks off 220vac but nothing that hospitalized me. But I do distinctly remember a shock recieved by a friend. He had a illegal cb with a zetagi 1kw valve linear amp, it tended to carbon up its changeover contacts and loose quality on ssb so I showed him how to turn it off, isolate it, drain it down and clean them up with contact cleaner. And I kept repeatedly stressing, dont do this without doing the whole isolation things as it will kill otherwise. Well, one day it went bad in the middle of a qso, and this was to some prized russian area, so throwing caution to the wind, he sprays contact cleaner at the relay while mid conversation, while holding a aluminium microphone in other end to talk it up. You guessed it, the valve hv field collapsed into the stream of contact cleaner, threw him across the room and into a wall and his glasses were blown off and twisted by the event. His girlfriend took him to hospital and it took a fortnight before they were happy with his vital signs to declare him fit to leave. All I could say when I visited him was “I bloody told you so” but his girlfriend was up for blaming me “for showing him”, and since then I’ve shied away from showing people things that if they ignore some of my warnings could kill them.
Tom Baker is turning his long-lost Doctor Who movie script into a novel | 220v Contactor Relay Related Video:
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