I have a PIR (passive infrared) motion sensing light on my porch for more than a year, and I’ve noticed that it can sense some of the cars that go by. If the car has been running, like coming home it will usually trigger the light. But when a neighbor starts the cold car and
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A quote from https://www.eia.gov/outlooks/steo/ << EIA forecasts that planned additions to U.S. wind and solar generating capacity in 2021 and 2022 will contribute to increasing electricity generation from those sources. EIA estimates that the U.S. electric power sector added 17.5 gigawatts (GW) of new wind capacity in 2020. EIA expects 15.3 GW of wind capacity
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Wow, listen to the meter go crazy when it’s near that cat! H-O-T-!!! https://youtube.com/shorts/8D9BYHVxjRg
Photo from ?? Thanks, Mike Guerrucci. This is a simple device. That means it’s just a buzzer and a battery. And it has a super sensitive magnetic switch. This detector is always open until it is disturbed by a magnetic field. They call it a magnetometer. One way to make this is to use a
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So many ideas about the future promises of nuclear fusion power, how it will affect the world. Will nuclear fusion ever become a reality? It remains to be seen. In the meantime we will have to make do with renewable energy, mostly wind and solar. The goal is to greatly reduce use of fossil fuels
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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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I started thinking about how the makers of transistors sort the different grades of transistors as they’re manufactured. I thought that a reasonable analogy would be similar to how a farmer might sort the fruit he harvests. Here’s what I came up with.The farmer starts with the fruit his workers have gathered. The fruit is
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from FB group Building Transistor Radios 2018-08-22 Olek Kopyto I recently did some tests on 2N3904s I got from Mouser and from a Chinese eBay seller. The ones from Mouser had a current gain of right around 200, right in the middle of the 100 to 300 gain range according to the data sheet. The
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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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From my FB comment Some comments say measure with a meter, but fractional ohm resistors don’t measure, or barely measure with the typical ohmmeter. Instead, you should be giving better advice. You should use the device between your ears to find the resistance. The resistor should be put in series with another resistor of
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