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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I needed to pick some grapefruit from the tree, and I borrowed the picker pole from a friend. I put it in my Civic and got home, took it out and picked some ruby red grapefruit. Man, were they Delicious! So Monday I got in the car, and CLICK! It wouldn’t start. Then I noticed
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I have often seen schematics of Joule Thief chargers for use in charging Ni-MH rechargeables from used alkaline cells. The idea is to boost the voltage of the used alkaline cell up to high enough to get current the flow into the Ni-MH cell. One setback is that conventional JTs are only 50% efficient, so
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Thanks for the article, QS. It shows a whole lot more than Batterizer’s website. Now that I see what it looks like and how it works, I’m more convinced that it’s not snake oil. According to the article they have been able to miniaturize the circuit. They say the circuit has been around for awhile.
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I ordered five of the Ravpower RP-PB08 portable chargers and after I got them and showed them to my friends, they suddenly remarked that they needed one of them. So my five have suddenly dwindled to just a few left and those may disappear, too. These are rated at 3200 mAh. That’s just a bit
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I have been working on my own “Power Bank” for recharging my cell phone. I went to the NOCCC Computer Club meeting last Sunday and to the Mobile Computing meeting. Ben, who started this meeting, decided that he wanted to buy some ‘power bank’ USB chargers for himself, family and friends. He could’ve got then
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Earlier this year I bought a cheap cell phone charger for plugging into the car’s cigarette lighter socket. It works, but it’s s-l-o-w. I can drive for a half hour with the cell phone plugged in and it says it’s charging but it only charges a few percent. As a result, I don’t use the
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I recently read about RadioShack losing $200 million last quarter. I went to one RS store and found they wanted over $20 for a 5 foot USB male A to micro USB cable. I told the salesdroid that I could get a similar cable for a fraction of that price at a dollar store. He
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Paul is experimenting with a Joule Thief using some germanium transistors I sent him. I thought about a few quirks of germanium transistors that I may not have (or may have) blogged earlier. The vintage germanium transistors were made at a time when the solid state manufacturing technology was much less advanced than it is
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