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In this project, you will make a flashlight that works without batteries. Even more amazing, you can recharge it in three minutes and it will run for...
First, solder a wire from the (+) on one capacitor to the (-) on the other capacitor.
Solder a 4-inch length of red wire to the unused (+) terminal on the capacitor. You will call this capacitor wire (+).
Solder a 2-inch length of black wire to the unused (-) terminal on the capacitor. You will call this capacitor wire (-).
Next cut the 1/8-inch plastic sheet for the flashlight case. Generally, this is accomplished by scoring the plastic, then breaking it along scored li...
Using the scoring edge (not the knife tip) pull the knife along the fine line several times until you create a groove. The plastic can now be snapped ...
Now you're ready to build your flashlight case. First, cut out three 1 1/4 x 7 inch pieces of plastic and glue them together with epoxy. This is the ...
Cut a plastic piece 1 1/4 inches by 1 1/2 inches. Drill a 1/4-inch hole and insert the 1/4-inch jack. Hold the jack with one hand (to prevent it from ...
Solder a 2-inch-long black wire to the end of the jack near the tab. Solder a 3-inch-long red wire to the other side of the jack (away from the tab).
Solder the red wire from the jack to the capacitor (+). Solder the black wire from the jack to capacitor (-). These wires form the path that wil...
Cut a piece of plastic, 1 x 1 1/4 inches. Drill two 1/16-inch holes in the center, side by side, the same distance apart as the leads on the LED. Cut ...
Remove the paper backing from the tape and fasten the tape to the plastic. This is part of the reflector for the flashlight. Insert the LED leads thro...
Cut a piece of plastic 7 inches by 1 1/4 inches. Drill a 3/4 inch hole 2 1/4 inches from the end. This is the plastic switch holder. Press the on/off...
Solder one end of a 6-inch length of black wire to one end of the capacitor (-). Solder the other end to the on/off switch.
Solder the wire from capacitor (+) to the long lead of the LED.
Cut a 2-inch length of red wire. Solder one end to the short lead on the LED. Solder the other end to the on/off switch.
When the switch is on, power will flow from capacitor (+) through the LED, through the switch, back to capacitor (-). This will cause the LED to light...
Cut a 1 by 3/4 inch piece of plastic. Insert it into the flashlight body, between the jack and the capacitor. This will prevent the capacitor from sli...
Place electrical tape over the on/off switch wires.
Glue the LED holder into the flashlight body.
Place metallic tape inside the flashlight body and on the plastic switch holder to form the reflector.
Glue the plastic switch holder to the flashlight body. Cut a 1 1/2 x 1 1/4 inch piece of plastic for the lens. Glue the lens in front of the LED.
Plug a 3-volt DC power supply, (+) tip, into the back for three minutes. Remove the power supply and enjoy your new flashlight.
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