The easiest way to revolutionize your computer’s audio | 19mm Momentary Push Button

All of this, if you suppose that you are taking a full hand of cable. Got shocked a few times with AC (and DC as well) and since I was just thouching, not handling, I had no trouble to get away with it (just swearing A LOT and throwing my screwdriver through the room).

It’s a great idea but a shame it isn’t laid out correctly, The traces on the low voltage side of the opto-couple are too close to the mains voltage and also the trace from resistor R8 to the opto is too close as well.

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.

Norm, remember your high school electrical classes, and don’t confuse the young ‘uns here. I’m sure you’ll recall that halving the current reduces losses (heating) in a conductor to one quarter: losses are proportional to the square of the current.

I use a variety of a/c and dc fostek ssrs. I have yet to have a problem, but i use them in circuits where 50% of their rated current is the absolute maximum they will ever see.

Your advice / admonition overlooks the reasonable likelihood that the part wasn’t *really* rated for what it *claimed* to be rated for, nor was it constructed in a manner to keep it safe in the event of an actual failure– as in the article’s example. Such that even if he were a licensed and well-experienced “electrician” (or anything else), it STILL would (could) have failed and caused the same problem. So what you’re saying IS good advice in a general way, but only partially relevant to the actual incident from the article, IMO of course!

I am not going to go right into the above calculations as there are plenty of graphs and tables out the on the net that you can google for. Example – http://electronics.stackexchange.com/questions/22796/creepage-distance-for-pcbs-handling-line-voltage-ac, http://www.smps.us/pcbtracespacing.html

Best answer: Probably. The Amazon Smart Plug was designed to work with most any product you have in your home but there are some exceptions and devices that shouldn’t be connected.

can’t be said too many times: foteks are known to roll over, fart and let the smoke out. doesn’t hurt to overspec by 3-5. not when playing with fire.

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They made me a 110v silicone rubber heat bed with adhesive backing at the size I wanted with 2 integrated thermistors and appropriate cabling for like $60 delivered to my door. Add a 110v relay and you’re good to go. The Eustathios and Herculien builders group have been using these for a while.