Lenovo’s latest Yoga laptop has an ARM processor and 25 hours of battery life | 19mm Momentary Push Button

First, some background. I am a design engineer working on safety of life critical hardware design and technology development for a military application. I noticed this project a while back, and I invested some thought into how I would design the system.

my first “real” job was in a video game arcade back in the 80’s my boss was a really cheap prick that used to buy asian cocktail machines that were “native” 110V, with a 240V to 110V step down transformer wedged in where it would fit, my second day I was fishing out a 20 cent coin that had missed the coin box, I got “zapped” hard enough to blow my finger nail in half and stop my heart.

I can only think of a single instance in the last six months where the HPWC higher charge rate would have made a difference for us, and even then it would have simply made leaving for a long trip slightly more comfortable.

Knocking over a candle would be an accident. Keeping barrels of petrol in your living room would be negligence. Doing your own mains wiring without the proper qualifications, I dunno which side that falls on. Real accidents can’t be foreseen, but you have to take reasonable precautions.

Typically, drivers are rated to handle surges in the range of 1 to 4 kV. The varistor, ranging from 7 to 14 mm in diameter, is usually located downstream of the fuse on the ac mains. However, to provide higher-level surge immunity for lighting installed outdoors in exposed surge environments, outdoor-lighting OEMs may want to add surge-protection devices (SPDs) on the ac input lines of their luminaires ahead of the LED driver.

Don’t those wild & crazy Brits use “electrocution” to include a non-lethal shock? Our friend [Moryc] could have learned English from Britlish speaker, as he mentions that he’s not a native speaker of our bastard tongue (though, he could have fooled me with that delightful prose).

Retired engineer, 71 years young. Computer builder and programmer. Linguist specialising in language acquisition and computational linguistics. Interested…

Reading at least the related article and a datasheet before making comments about something is quite a heavy task to ask this days…

The melted solder was probably a secondary failure. When SSRs fail they often turn into heaters as his did and the heat from the base plate itself melted the solder before incinerating the plastic housing.

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I found the Sony A33 and A55′s AF tracking to be very fast and pretty accurate; almost too fast in some cases: If I let the central AF point wander off the subject for a fraction of a second, focus would quickly shift to the background. Many of the missed-focus shots I took were the result of this problem, versus the camera not being able to track focus quickly enough. Some high-end DSLRs have settings in their autofocus systems to adjust how quickly they respond to momentary loss of the subject. (Either from the AF point drifting off the subject, or for some interfering object passing between the subject and camera.) If Sony were able to add this capability to the A33/55, it could go a long way to reducing the number of missed shots, at least based on my experience.

I use a contactor with my sonoff, 1kw pool pump. The sonoff is seriously under specced for switching a pool motor.