Is my appliance compatible with the Amazon Smart Plug? | Lrd12 Overload Relay

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.

I’ve not tried to account for phase differences (that is, power factor). It’s very naive. I measure the current via a CT and compute RMS across a whole cycle, then I find the peak voltage and do the math.

Tomczyk is a professor of HVACR at Ferris State University, Big Rapids, MI, and the author of Troubleshooting and Servicing Modern Air Conditioning & Refrigeration Systems, published by ESCO Press. To order, call 800-726-9696. Tomczyk can be reached at [email protected] (e-mail).

Please nobody get one of these boards. It is not a safe design for working with mains voltages. This guy has not followed guidelines for minimum creepage and clearances between the low voltage and mains side. You think it’s optoisolated and it may work fine for the majority of the time, but as soon as a mains voltage spike comes along it could bridge the gap and zap your circuit and you if you’re touching it (and your computer if you’re doing doing dev work at the time).

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。

Agreed…. I used to have a small plastic box in our workshop. It had two copper contacts on opposite surfaces, and a 9V battery, relay and tilt switch inside, and a Caution High Voltage sticker on it,

Also power the unit directly from the mains ( http://ww1.microchip.com/downloads/en/appnotes/00954a.pdf ) with the ability to power the unit directly with DC when (re)programming the ESP8266

My original quote is based on the project you called me in for. If I find out there’s actually a larger issue at hand, I’ll need to increase my price to match the scope of the project. I’m not ripping you off, I’m just making sure I get compensated for the extra work.

Opto-isolated TRIAC is fine and dandy, but there is no fuse, so if you overload it, you have a cooking TRIAC in your junction box …

China is a shithole. Business-wise it’s like the West was 300 years ago, when your “flour” was cut with chalk dust and all the rest. Except apparently in Chinese culture it’s seen as enterprising and showing initiative, to concoct little wheezes like this for a profit, rather than the thievery our own culture for some reason sees it as.

These ratings on the data tag tell us exactly what minimum ampacity the circuit must be capable of carrying as well as the maximum size the circuit breaker or fuse may be able to protect the circuit against in an overcurrent condition.

Meanwhile in my house (uk) we have a street lamp time switch with a single pole switch that looks like it was designed to handle 30A. It is beautifully engineered from brass that increases the on period as the days get shorter, I felt bad hacking it so that it would turn on my water heater for an hour twice a day, a job it has been doing for 17 years now without incident. Electromechanical is by far the best way for high current loads at any voltage as fatcas I’m concerned.