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Rechargeable led flashlight powered by magnets housed in the obligatory mints container.
PARTS: 150 ft. 30 gauge enamel-coated magnet wire 4 1/8" rare earth magnets 4 rectifier diodes (IN4007 MIC) Resistor (22 ohm) White led Switch Some ...
This part could really be made from anything (i.e. stiff paper), I used the pen because the magnets just fit inside the tube. Cut your tube a little...
Cut a slot down one of the endcaps. Leave 3" of wire hanging out of this slot and begin carefullly winding the coil. Winding this coil is probably t...
Remove label from the Tic-Tac container and take out the top. Cut off about 1/4" of the bottom leaving 1/8" lip. Save the scrap. Drill a hole big en...
Cut off enough of the scrap to make a plate for under the lid. Use little pieces of scrap to shim the plate so it is level. Cut out a slot for your ...
I just hot glued the switch to the plate. I also glued the led in place at this point, but it's not in the picture.
This is the circuit:
This is all free hand soldering, hopefully yours will turn out less messy than mine.
Now just slide the top along with the circuit into the case. I think it helps to epoxy the top on, but you could probably just superglue it. I ended...
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I tested this theory, I used Jamicon WG105°C 16V 1000uF capacitor, 4,7k resistor and a red LED. Supplied 12 volts for a moment and it light it only for 10 seconds of useful and 30 seconds of visible light. I suggest try to use a 1F capacitor for this purposes, as the capacitor is only thing that doesn't need charging controller to operate many thousands charging cycles and doesn't get damaged from overcharging, left uncharged or deep discharging.
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