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After seeing the Rusty Nail LED Night Light I am thinking that Dick Cappels may be the off set name of MacGyver.  If you don’t have any CAT-5 wire handy why not use some of the wire out of an old transformer.
“Those who are familiar with some aspects of coil core selection would quickly point out that the eddy currents would be huge since iron has a low resistance compared to ferrite, or air for that matter, and that there would also likely be other types of large losses. The point here is not that you should run out and buy some flooring nails to make LED lamps, but that this circuit was not “designed”, but was thrown together and worked quite readily. If a rusty nail and some telephone wire is enough to light up a white LED, then the inductor is not so critical. So, relax, go buy a ferrite core and get started on your project.”
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March 22nd, 2007
This is a great example of how inductors work! By building one, you can see exactly what the science is behind it.
March 25th, 2007
[…] DIY, electricity, gadgets, inductors, macgyver, rusty nail Posted March 23rd 2007 Permalink | Email this | Comments (0)54 […]
March 27th, 2007
[…] Rusty Nail LED Night Light - [via] - Link. […]
April 7th, 2007
But what’s the purpose of the nail? Couldn’t you just use the battery?
April 7th, 2007
The battery does not have a high enough voltage to power the LED, this circuit increases the voltage high enough to power the LED.
April 10th, 2007
Very kewl indeed.
November 2nd, 2007
[…] Make has a great weekend project that shows you how to make a Joule Thief, this is a device that allows you to run an LED from a single 1.5 volt battery. For a similar project check out the rusty nail LED project. Via: Make Other than the toroid coil here is everything that you would need: 1K Resistor NPN Transistor Blue LED or White LED […]