Charting the S&P 500’s range-bound, but bullish, (unofficial) summer start | Lrd12 Overload Relay

I’ve used 220V heaters to cook meat and I survived (quite well fed) up until now. I suppose heating a piece of plastic can’t be that much more difficult, although wh

“180 bolts per second”? Now there’s an engineering unit I’ve never encountered in more then 50 years. No, it’s just a 150-180 volt sinusoidal or square wave at various frequencies. In past years, the coil on the bell was mated to an appropriate capacitor to allow ringing a specific phone on a “party line” based on the ring frequency. It was amazing stuff for a time when they simply hadn’t run enough wires for all of the individual “private lines”, so they had to engineer very basic things to fill the need. It was in a sense, the most basic and pure form of understanding the physics (electrical and mechanical) hacking.

Dunning-Kruger effect. It’s impossible to correctly estimate your own stupidity. This is the cause behind half of everything wrong in the world. The other half is psychopaths in positions of power.

Thanks for letting me know about the typo and qualifier on the 208V part. I’ve updated it in the article.

The Sony A33 ships in the US market from mid-October 2010, with pricing of US$750 for the camera body and an 18-55mm kit lens, or $650 for the body only package.

Waterjet, who seemingly has no concept of how a basic opto-isolated diac-driven triac circuit works, chimes in with useless blabber about insufficient current ratings of the *optoisolator* — seriously? If you’re going to throw stones at someone, perhaps you could verify that you have somewhat of a clue of what you’re talking about?

Matt Reed, the Creative Technologist at redpepper who shepherded the project, explained via email: “I got all of the Waldo training images from Google Image Search; 62 distinct Waldo heads and 45 Waldo heads plus body. I thought that wouldn’t be enough data to build a strong model but it gives surprisingly good predictions on Waldos that weren’t in the original training set.” Reed was inspired by Amazon Rekognition’s ability to recognize celebrities, and wanted to experiment on a similar system which supported cartoons. He had no prior experience with AutoML, and it took him about a week to code the robot in Python.

Yup. That’s how you install an outlet for a big dryer or a welder or something than needs the extra power. Never occurred to me to utilize it for a computer PSU, but I suppose it’s pretty nice when you need to squeeze out every little bit of efficiency.

Actually what they WOULD question is why you’d throw a big power brick on something if you’re just doing resistance heating. Bizarre…

The best defense is to make sure you buy from reputable sources, not from some backyard hardware store or eBay.

[Nick Sayer] falls into the “would rather build it than buy it” category. This particular project is a clone of a fast electric vehicle charger. There are commercially available versions sold under the Quick 220 brand name. The idea is that for fast charging, some electric vehicles call for a 240V outlet and Americans without electric cars often don’t have one. If they do it’s for an appliance like a stove or clothes dryer and probably not found in the garage.

Solar charging becomes more cost effective, however, if you’re tapping into a full-house power system. Sources suggest a properly sized whole-house solar system can pay for itself in around seven years, depending on the size of the installation, local labor rates, component costs, and other variables. The national average for a 6-kW home solar power system is reportedly close to $19,000. Fortunately there’s a 30 percent federal tax credit with no limit available to help offset the costs. Unfortunately, the solar-power credit is scheduled to drop to 26 percent in 2020, 22 percent in 2021, and will be discontinued altogether in 2022.