Lenovo’s retro ThinkPad 25 laptop leaks | 19mm Momentary Push Button

The one thing some users might find distracting about the Sony A33′s EVF is the RGB "rainbows" you can see when either your eye, the subject, or the camera is moving rapidly. Each pixel of the display shows its red, green, and blue information sequentially, so if the viewfinder image is moving rapidly relative to your eye, you’ll see red, green, and blue ghosts or trails around bright objects. I didn’t notice this at all until someone pointed it out to me, but after they did, it became unreasonably annoying for a while. After a couple of days of shooting with the camera, though, I again became largely unaware of it and now have to deliberately look for it to be aware of the effect.

This seems to me that your experiment failed due to thermal failure cased by insufficient cooling and not the part itself..You stated yourself that the part failed due to thermal expansion (insufficient cooling). But it’s still a valid experiment with valid results. And you show that it’s up to the designer (or designers) to design the entire product, which includes sufficient cooling. This is one area where home designs fail – a lot.

This. An isolation transformer can be a very useful thing, but also very dangerous. If you touch ONE end no problem, but if you touch both ends you will get cooked and the RCD will NOT trip. Or more directly: An isolation transformer does NOT allow you to switch off your brain! And NEVER connect a scope to such a transformer.

To be exact: It’s the anode or acceleration voltage. Focus is usually some kV, but derived from a 100Meg voltage divider.

The camera can’t always perfectly compensate for how you move the camera during the panorama, nor for extreme perspective shifts, so you’ll sometimes see "stitch errors" in the assembled shots. The slight "stuttering" above left in a shot from the Sony A55 is typical of the mild errors that sometimes occur: Pretty unobtrusive, unless you really zoom in to pixel-peep. More dramatic errors like the crop from an A560 panorama seen above right were fairly rare in my experience. This is a great feature for dramatic vacation snapshots, but if you’re making panoramas professionally, you’ll still want to build them manually from separate shots.

If I scan a ceiling and I find a cold spot that doesn’t make any sense, I dig into it. Maybe it’s a plumbing leak from above, or maybe it’s just a cold water line that’s touching the ceiling. That’s where a moisture meter comes in handy. Ok, I’m getting sidetracked. Let’s discuss some electrical examples.

Operating temperatures are another consideration. Assume the ambient operating temperature for this application ranged from 0 to +70°C. This would be within the MOV’s -40 to +85°C rating, and there would be no requirement for derating of surge current or energy across this temperature range.Taking high-line tolerance into account, a 275-V ac-rated MOV may be chosen for this example. Using a 2-hp, single-phase, medium-sized motor, the MOV’s required surge-current rating would be determined by the peak current induced at the motor supply. Assuming a service location for the motor and a line impedance of 2 Ω, it was determined that a 3-kA lightning surge was possible. In this case, one datasheet indicates a maximum clamping voltage of 3 kA at 900 V, which is below the 918-V suggested stator-winding withstand capability. If the motor’s operational life were estimated to be 20 years and specified as being able to withstand 80 lightning transients during term of service, the datasheet pulse-rating curves would verify a rating of 100+ surges.

Snap! Didn’t even get the first instrument lit. I began to investigate. Wiring size, check. Dimmer output side breaker, still on. Go further down the line and find that the electrician had indeed taken care of it. He re-did my calculations, which at full nominal load looked like a 15 amp breaker on the input side of the dimmer would work just fine. What they didn’t realize is that when you bring an instrument or instruments (depending on the circuit) to full on, you go beyond even 20 amps for just a moment, then it goes down to about 13 amps.

The best tip for buying a portable home generator: Don’t wait until the lights go out. Whether you live in a place at the mercy of snowstorms, hurricanes, heat waves or an outdated electric grid, a power outage can range from an annoyance to life-threatening.

UL rule of thumb for shock hazard: 1.5mm / 60mils distance between a hazardous live conductor and something touchable for single insulation level protection (double that for double insulation).

You’ll notice that I didn’t explain exactly how to correct this. I do this intentionally because I’m not going to do the work. This situation could be easily fixed by replacing the dimmer switch with a simple toggle switch, by installing a dimmer rated for a higher wattage, or by installing bulbs with a lower wattage. Any of those would be fine, but as the home inspector, I don’t design the repairs.

The microwave I recently tore apart had a hefty resistor connecting the capacitor to ground, to quickly drain it of power when the magnetron itself wasn’t energized. (The capacitor itself had a label saying there should be a resistor bridging the cap’s contacts for the same purpose.)