Google’s Night Sight for Pixel phones will amaze you | 220v Contactor Relay

Last year, Sonos announced plans to add support for Apple’s AirPlay 2 to its speakers. AirPlay 2 is a significant feature in that it will allow iPhone and iPad users to send audio from basically any app to Sonos’ great-sounding speakers. And you’ll be able to tell Siri to play tracks from Apple Music on Sonos systems; the Sonos One smart speaker doesn’t currently let you launch music from Apple’s service with voice commands, but AirPlay 2 is a roundabout way of introducing that convenience. The difference is that you’ll be doing the talking to your phone instead of the Sonos.

“AC is safer than DC. You can let go of two AC terminals but not DC as DC keeps your muscles clenched. AC doesn’t. ”

I play around w/ HV/low amperage PSUs all the time, that stuff will make you lose control of your muscles…

Oh well… That industrial relay has ‘almost’ the same contact ratings of a simple songle srd-05v sl-c relay (specifically the C form/single phase). But I’m sure it won’t last as long as 20y+ in such harsh environment.

If you hesitate at the thought of doing this math for every system you work on, the NEC Article 110.3(B) states: Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.

Called the MPSMv2, the core of the project is the ESP8266 module. The dev board itself can support anything with GPIO pins, whether it’s an Arudino, Raspberry Pi, or anything else with those features. Flashing the NodeMCU firmware is pretty much all that needs to be done in order to get the device up and running, and once you get the device connected to your WiFi you’ll be able to control whatever appliances you want.

It may be just perception coloured by the general work environment, but a lot of the US regs seem driven by liability concerns. Too many lawyers.

The operation of the potential relay is based on the increase in back-electro-motive force (back-EMF) or a bucking voltage that is generated across the start winding as the motor increases in speed. The large metal mass of the motor’s rotor turning at high speeds with motor windings in close proximity has a voltage-generating effect.

https://www.ul.com/newsroom/publicnotices/ul-warns-of-solid-state-relay-with-counterfeit-ul-recognition-mark-release-13pn-52/

I do not recommend diy 120/240 volt AC in this application. While you are correct that the higher voltage allows lower current draw, you are not proposing limiting the current, which can be very dangerous. If your hands were wet with sweat, you would act as a lower resistance path to any available ground you might be touching. In much the same way a hot dog will cook with 120 AC poet applied to each end, you will do considerable damage to your skin, muscle, and fat tissues along the current path. Use DC power, a larger wire, and maintain the safety margin. One trip to the ER will buy many hundreds of meters of wire and plenty of DC power supplies. Oh, and by the way, I’m an electrical engineer.

Movie mode. The Sony A33 offers high definition interlaced video capture at up to 1,920 x 1,080 pixel resolution, commonly known as "Full HD" or "1080i." While Full HD videos are recorded using 59.94i or 50i interlaced field rates, the actual sensor data is clocked off at a frame rate of 29.97 or 25 frames per second. Using the non-standard 1,440 x 1,080 and standard definition VGA 640 x 480 pixel modes, progressive scan videos are created, matching the same actual sensor frame rates. One quirk of the A33′s design is that when shooting VGA videos, the focal length crop is increased just slightly, yielding a video feed that appears to have been shot with a more powerful telephoto lens (and in the process, making wide-angle video harder to achieve). The closely related A55 model doesn’t share this feature, which we’d speculate is likely due to some limitation as to how data can be most efficiently clocked off the CMOS image sensor in video mode.

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