In China, industries burned coal and people burned coal for cooking and heating. In cities like Beijing the air pollution was so bad that it was hard to see the stop lights and pedestrians had to wear facemasks. The pollution killed estimated millions of people with lung problems. China realized this and has done a
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I bought two of these motion sensing LED lights for my hallway. They have a rechargeable cell that is charged through a micro USB port. To see one inside watch big Clive’s YouTube video – the ebay link to buy them is in his description. The charge lasts for more than a week with frequent
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From FB group electronics hobbyists Over the holidays I installed two solar 60 LED lights I bought on eBay. They stopped working just a few weeks after. I finally got up on the ladder and took them down to see why they died. Well, spit! The solar panel is plugged into the jack on the
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From FB group Jan 19 Joe Haupt In the ’80s I occasionally did work in an electrical room on campus that had a 7 foot slide rule that had been removed from the classroom. It was there for years, but the fire inspectors would make us keep the junk from accumulating in closets, so it
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From FB group Building Transistor Radios, Jul 27 Rolando Fernández I bought a kit for a digital die (one die of a pair of dice). I assembled it and then I rolled the die many times and wrote down the values to see if it was random. I was shocked! It was loaded! It was
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From FB group Orange Talk, July 13 Rebecca Joy It’s still not spelled right. 😝 It’s not Columnist Manifesto. The Communist Manifesto was only a few dozen pages long and at the time was considered the most influential document of the 19th century. The evil Commies were a totally different thing. The Communist Manifesto was
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From article in https://electrek.co/2018/05/11/tesla-giant-battery-australia-reduced-grid-service-cost/amp/
From FB group Another FB member, who’s not in the groups, has also built a battery capacity tester. I think he uses a 10 ohm resistor. The typical testers found online apparently use what the battery makers say they use in the data sheets. This link is for the .PDF of the apps manual for
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From FB group Hobby Electronics When a manufacturer purchases parts for the product they are making, they expect to receive what the engineers department had specified in the department’s documents. When the parts are received, the Quality Control department is supposed to check to see if the parts received meet the engineering documents. I know
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for FB group Electronics Hobbyists The demonstration of a wireless charging circuit that I built uses a Joule Thief circuit with two yellow LEDs in series. The coil is a hand wound loop about 75 mm or 3 inches diameter. A second loop of gray wire with a white LED (dimly lit at bottom) is
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