Microsoft and Razer are working on Xbox keyboard and mouse support | 220v Contactor Relay

Can you please tell me the minimum creepage and clearances between the low voltage and mains side by your standards? How have you done the measurements and decided is not enough? I’m more than happy to hear the story. Ans also again…did you hear about conformal coating and what’s for?

If you can power the logic side with some +5V derived from mains, there is no point keeping the optocouplers, right? Of course, the ESP would need to be programmed when unplugged from mains A/C, but with OTA, it should be possible to control it all wirelessly once the initial firmware setup is done, even more so with LUA where telnet over wifi can be used once initial setup is done. So now, what kind of circuitry is needed to hash mains A/C to +5V DC (or even better, directly +3.3V)? What’s in a commercial USB adapter? Greg

440.22 Application and Selection (A) Rating or Setting for Individual Motor-Compressors — The motor compressor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the starting current of the motor. A protective device having a rating or setting not exceeding 175 percent of the motor compressor’s rated-load current or branch-circuit selection current, whichever is greater, shall be permitted, provided that, where the protection specified is not sufficient for the starting current of the motor, the rating or setting shall be permitted to be increased but shall not exceed 225 percent of the motor rated-load current or branch-circuit selection current, whichever is greater.

Hey [Martin] I think you deserve some recognition for your contribution here tonight (or whatever time it is for you).

You don’t need a 3D printer to use a heated print bed for 3D printing? I’d think that having the rest of the 3D printer would more or less be required to use a heated bed to facilitate printing.

Engineering types have been known to reduce “Preventive Maintenance” in the large “Mains” switch panels in an attempt to save budget funding. A close friend stepped up to a sadly neglected switch panel, pushed the dis-connect and the panel door blew off in his face. It seems that dust is conductive, and will explode if a large spark is present. The good news, he is alive, and was promoted to avoid a lawsuit. :cheers:

When I was a kid I built a Tesla coil using a 12kV neon sign transformer which my mom got for me (this was the 1960s, before Americans turned into wimps). At some point I had the transformer sitting on my workbench and plugged in, with nothing connected to the output. The corona discharge made a hissing sound, but I had music on and couldn’t hear it. Perhaps eight inches away was my table radio, which had a metal chassis. I reached between the two to get something, and my arm shortened the air path enough for an arc to form. I had a couple of nifty burn marks (entry and exit) for a few weeks.

Australia is similar, except 3ph is uncommon in a house. There’s 3 phase at the kerb and each house is connected to one phase.

Something about your calculation here doesn’t make sense to me. 117 EV miles, and I estimate a Niro like this will get roughly 3 miles per kWh (that’s what my Volt does roughly). That means 117/3 = 39 kWh used. 39 times your cheap electricity rate is $2.54, not $7.61.

Since the translucent mirror only reflects enough light to provide for the autofocus sensor, not an optical viewfinder as most pellicle designs permit, Sony has adopted full-time live view in the Alpha A33 and A55. In place of the optical viewfinder from a traditional SLR, the SLT cameras have an electronic viewfinder with 1,152,000 dot resolution. The EVF LCD is time-multiplexed — that is to say, it shows each color in sequence at every pixel location, rather than the separate, adjacent color dots of most electronic viewfinders. This makes it harder to distinguish individual pixels. The Sony SLT-series cameras also sport a wide-aspect 3-inch LCD with 921,600-dot resolution. Taking full advantage of the camera’s full-time live view shooting, the super-slim LCD tilts 180 degrees vertically, and swivels 270 degrees for easy viewing from most any angle. The cameras also include TruBlack technology borrowed from Sony’s picture frames.

Capacitive or Resistive Voltage Dividers are not really an option for this device since the ESP8266 draws a relatively high current. You would have a high power dissipation (resistive) or a VERY large capacitor. A more complex design or a small transformer has to be used here.

Keep in mind that extension cords running from a generator can power anything that plugs into a wall socket, but not hard-wired appliances such as a furnace, sump pump or central air conditioner. If you want to run any of those during an outage, you will need to have a licensed electrician install a manual transfer switch (it looks like a mini circuit breaker) next to your main electrical panel. A heavy-duty cord from the generator plugs into the switch and allows you to power select circuits in your home. Prices vary depending on your market. In Neale’s case, she paid about $1,200 for the switch and installation, more than for the generator, which cost about $550.