The end of Instagram as we know it is here | Lrd12 Overload Relay

Creating a PCB heat bed isn’t an art – it’s a science. There are equations and variables to calculate, possibly some empirical measurements by measuring the resistance of a trace, but Ohm’s Law is a law for a reason. If you do things right, you can make a PCB heat bed perfectly suited for the task. You can even design in safety features like overcurrent protection and fuses. It can’t be that hard. After all, your house is full of devices that are plugged into the wall.

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It’s the same with larger, more power hungry projects as well. [Nerd Ralph] has been running a mining rig for a few years now, and has learned just how important proper power supply management can be. His strategy involves using interlocks to ensure everything powers up at the same time to avoid feedback problems, running a separate ground wire between all GPU cards and the PSU and running the supplies at 220 for the NA folks.

Combining breakthrough translucent-mirror technology with Sony’s high-speed CMOS sensor prowess, the new Sony Alpha A33 and A55 break important new ground for consumer SLRs. Both deliver higher capture speeds than other consumer-class digital SLR, at 7 and 10 frames per second respectively, as well as true phase-detect live autofocus during video recording. Thrown in multi-shot technology (Handheld Twilight, Sweep Panorama, and Auto HDR modes) brought over from Sony’s digicam line, and the new cameras offer features not found in any other SLR, regardless of price point.

Always pay attention to the safety warnings, and never underestimate the stupidity of anyone, most importantly your self.

And this AC vs DC case when it comes to skin effect, is a reason for why some Data centers use DC distribution, as most server products uses switch mode power supplies and therefor has an internal bridge rectifier.

Turns out my old GTX670 draws a lot more power than my new GTX1080 and, based on napkin calculations, brought my total power draw a bit too close to my 750W PSU’s limit. (200W CPU doing me no favors…)

One aspect of ac motor protection is the surge-withstand capability of the motor itself. Paragraph 20.36.4 of the NEMA motor generator standard MG-1 defines a unit value of surge as:   u × VL-L (or 0.816 × VL-L) where VL-L is the line-to-line voltage of the ac power system.

L2 EVSE (preferably hardwired) is much safer, plus much better experience. Don’t have people say: “Why isn’t my car charged, it has been an hour?”

Cooking Triac? In my experience there are only good Triacs and bad Traics. You can tell the bad Triacs because they usually have a a little bit of plastic encasing still attached to the three legs after they have exploded.

Interesting how both the sounds and the letters on a QWERTY keyboard for V and B are close enough that it’s possible to switch them by accident.

You probably think OSHA is staffed entirely by millennials who have no idea what it’s like to lose a limb and act like it’s a big deal or something.