Re: Nannies want to stop you from building mains-powered projects

Pg 1 General Summary Almost two-thirds (62.0%) of these deaths were unintentional. Additional NCIS database searches indicate that there are at least an additional 39 electrocution deaths still under coronial investigation.

I read that to mean that the coroner has determined that 62% of electrocutions were accidental, and a remaining 39 electrocutions are still being investigated. Mixing units isn't very useful. That may have also been a typographic and arithmetic error where the authors meant 38%. My guess(tm) is that the remaining 38% deaths are either unknown, undecided, or may have been some form of "booby trap" murder. Difficult to tell without looking at the source data.

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Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

I fully agree, there's just no end to it all. Ignore Alison. He has an extreme phobia of electricity and won't even take the lid off a microwave to replace a blown fuse! One has to wonder why he ever became a service engineer in the first place; very poor choice of career for someone like that.

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He clearly didn't die, so all worked out fine in the end. No irrational fears to hold him back.

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Yeah but what about the nanny?

"too impoverished for a nanny" A LIKELY STORY.

Having anxiety about dangerous voltages is an excellent idea that feeling is there for a reason,and complacency is deadly

** At your peril - you raving f****it.

** Strange how I regularly work on tube amplifier plus pro lighting dimmers and large SMPS.

CD's monstrous ignorance is only exceeded by his colossal arrogance.

** Having no sane case to put, CD just makes shit up.

And what smelly shit it is.

** CD is a vile, criminal liar was as well as a complete moron.

He has no right being on this NG whatever Piss the s*****ad off, ASAP.

.... Phil

What I see is kids who are afraid of everything, which seems backwards to me. We brats who got burned and hurt are pretty tough, but the super-protected ones, who nothing has ever happened to, are scared.

I'm a great fan of "laying on hands". Feel a circuit board and see what's warm, or see if you can change the frequency of an oscillation or change a race condition. I did that yesterday with my new engineer. He found an oscillating in our I/Q modulator, so we looked at the oscillation on a spectrum analyzer and finger-poked around to find a spot that would shift the frequency. It was an AD8009 oscillating at

180 MHz. We'll use a slower amp, or just scale up the resistors to reduce the amp's GBW product. We just need gain -1 up to 50 MHz or so.

He enjoyed learning that trick. But I've had interns who refused to touch a PC board that was only powered by 3.3 volts.

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John Larkin         Highland Technology, Inc 

lunatic fringe electronics

3.3v! How could you ask them to touch that! I fixed a nuke supply the other day, over 3.3kV. When kids, who become adults, fear everything they do nothing & take no opportunities, thus failing at everything by default. It's a clueless culture that thinks that is the right way to go.

NT

I theorized that my 1200 volt pulse generator wouldn't shock me (it makes 7 ns pulses at 5 MHz maybe) so I grabbed the output. Nothing happened. If you tease it with a fingertip, you can get a tiny RF burn.

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John Larkin         Highland Technology, Inc 

lunatic fringe electronics

How long did they last?

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I get the exact same sensation from touching an exposed HDMI socket! Feels like about 110V. No idea why such a voltage should be present on an unshielded, exposed socket that kids could easily stick in their mouths. :-/

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A couple of months. Sometimes less.

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John Larkin         Highland Technology, Inc 

lunatic fringe electronics

We tend to keep them for years, then hire the best as regular employees. GT does a great job with interns.

I usually get student, summer job people. The advantage of calling someone an intern is that you can evaluate them for three months, and keep or not keep them, more easily than a full hire. Nobody gets fired. We did in fact hire our last two interns after about 2 months each.

It shouldn't take more than a few months to figure if someone is a keeper. If you keep them for years, and then just hire the best, a huge bunch of resources were wasted on the others. And they do feel fired.

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John Larkin         Highland Technology, Inc 

lunatic fringe electronics

"Y" capacitors.

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  When I tried casting out nines I made a hash of it.

A mains filter that has an Y-capacitor is intended to be connected to a Class I grounded socket. If it is connected to a Class 0 ungrounded socket or incorrectly uses an ungrounded (Euro) plug, the device internal chassis is about Vmains/2, which is then visible e.g. in external connectors.

At 230 V mains, the connectors would be at about 110 V.

In case the chassis is not connected to a grounded plug/socket, the Y-capacitor capacitance should be selected so that the leakage current is not harmful to humans, but may destroy electronics.

You're far too charitable.

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Sure is. Lefty obsession.

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Blazing Saddles: