I was perusing the stuff on eBay and found a couple things that interested me. The first was the Remote Control Light Socket. It screws into the existing socket and then the light (says LED) screws into it. I’m hoping that since it says LED they did not do something funny and reduce its current
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Well, this is not new, the 100 watt and 75 watt incandescent bulbs have already been banned for awhile, but starting today, 40 watt and 60 watt incandescent bulbs will be banned. These will no longer be manufactured or imported into the U.S.A. There are some exceptions, such as appliance, fish aquarium and specialty lights,
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This is a continuation of the 2013 Dec 18 blog. It was getting too long, and so is this blog. Update Dec 24 – I searched for high current pulse gen schematic using Google and I didn’t come up with anything near enough to what I’m looking for. I saw a lot of high tech
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See Note at bottom. Years ago I bought a shake flashlight and it was nearly worthless. I shook it for quite awhile, and as soon as I stopped, the LED went dim. So how am I supposed to shake the light and try to aim it as something that needs light? And if it wasn’t
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Well, the LEDs I ordered more than a month ago have finally arrived. They are 10 Watt(!) 900 lumens from Electronic Goldmine for $6 (USD) apiece (I checked their website and they seem to be sold out). The reason why it took so long was mostly my fault. They were shipped to my previous address,
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In a comment, Metis asked: How can I reliably measure and/or control the output voltage of the JT? I’m currently trying to build a small power supply to recharge a Li-ion battery and I’d prefer to be able to keep the output voltage at (or rather below) a known level rather than invest in a
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I answered a Yahoo question: is joule thief fine as grade 12 physics final project? Additional Details Is the joule thief circuit appropriate as 12th class final physics project? I have made a joule thief circuit (http://www.youtube.com/watch?v=gTAqGKt64… as 12th class’s final project. Should my high school add this in my transcript for the Universities? Will
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In my earlier blog, yesterday I discussed using a 1 Farad capacitor to hold enough charge to run the flasher for several hours, from dusk to midnight or later. I checked Mouser’s parts and found a 1F 2.5V capacitor from Bussman for about 2 dollars in single unit quantities. Kind of expensive but cheaper in
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I’ve seen a lot of Xee2’s xee2vids on Youtube, but I don’t remember seeing this one before. It’s dated Sept 2011, so it’s more than 2 years old. The Joule Thief flasher obtains its power from four red LEDs connected in parallel, which are used as solar cells and charge a 10 thousand uF capacitor.
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One thing I’m glad to see is that many of the problematic parking lot lights have been replaced. These are the ones with the big, pinkish yellow light in them that has what I call the ten off, ten on syndrome. Once the light has spent a half hour heating up, it stays lit for
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