Portable 120V to 240V Converter; or How to Fast Charge at Your In-Law’s House | 220v Contactor Relay

VAC says: “The two 120V legs are *in phase* with each other.” Of course they are not. *by definition* if they were in phase there would be no voltage difference between them. The two 120V legs are 180 degrees different from each other, so the difference between them is 240V. Which is (of course) the supply voltage.

How about trying to say something accurate for a change? Almost everything you say lately is provably WRONG.

During service calls, being able to identify undersized conductors can help resolve compressor start issues or intermittent trips of breakers or fuses. Knowing appropriate and inappropriate breaker and conductor sizes will save you and your customers time and money.

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.

仲鑫达以“专业、 诚信、创新、合作、共赢”的经营理念、不断开发新产品、为客户提供优质服务、以最大限度追求客户满意、并不断开拓新领域业务。

The Sweep Panorama modes create lengthy panoramic images with a single sweep over the scene, and do a good job of automatically correcting for uneven panning, although they do sometimes show stairstepping in nearby subjects. The 3D variant is particularly unusual, in that it calculates separate left and right-eye views by comparing the positions of subjects as seen by the left and right sides of the lens. The result is saved as a multi-picture object file containing separate left- and right-eye JPEG views of the scene, for viewing on 3D displays.

220 volt +/- 10% isn’t really a good design standard. As it doesn’t live up to the requirements within the EU to start with.

Point taken. Perhaps it’s time to change of the the mindset, of the at large DIY community to when treated with properly 120/240 VAC can be used safely, as it’s being used day in and say out. I recall a project of Limor Fried made a project more as need be be becase she appered to be overly frearful of line voltage, then again she was taking into consideration the carelessness in the hacker community. One the flip side I personally know electrical engineers with decade in the filed who flippantly say 120 VAC can’t kill you. I know enough to know they are being full of shit In the end because of irritation fear useful resource is being ignored. Then again I have history of being comfortable with working on motor controls with neatly 800 VAC feeding them or working with electronic devices that have more than 30,0000 volts inside the cabinet. Lower voltages bring greater safy to life burt rquire higher current to do the amount of work, potetiall a fire hazrds id something goes wrong.

It’s not all a bed of roses with video and live AF on the Sony A33, though. While it tracks action very well, focus actuation with the kit lens is far from silent: In anything but a very loud environment, the "chock… chock" of the lens’ focus operation is painfully apparent in the audio track. Even with the ultrasonic motor-equipped Sony 70-200mm f/2.8G lens attached, focus noise was quite audible in quiet environments. Another really annoying (and entirely avoidable) audio artifact is the loud click that’s recorded at the very end of each video clip; the sound of your pressing the video on/off button to stop the recording. I experienced this with the NEX-5 as well, and it honestly seems like a bug to me.

After checking to make sure the outlets are wired correctly, a 220v light bulb with light up across the two hots if they are opposite phase and not if they are the same phase.

Video capture is an area where the Sony A33′s translucent mirror technology makes a huge difference relative to pretty any other SLR currently on the market, and relative to even fast-focusing SLDs. Every other interchangeable-lens camera currently on the market either doesn’t autofocus at all when recording videos, or has to resort to slower and/or more obtrusive contrast-detect focusing. Because the Sony A33′s phase-detect AF system is always looking at the subject, fast autofocus during video recording is no problem.

On an MV distribution there is no neutral or ground wire, just the three phases with a delta / star transformer to make the LV.