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 more than 24 hours. Because the ultra capacitors can be recharged thousands of times, you may save the environment from ever receiving an old flashlight in the trash system.
This project is from my book HaywiredClick here to order a copy from the Chicago Review Press.
(2) 220 farad capacitors, www.digikey.com, #589-1013-nd
Insulated wire, black and red
LED, high brightness, www.jameco.com, #217525
12" x 12" acrylic plastic sheet, 1/8" thick
(2) C clamps
1/4" jack, Radio Shack, #374-280
SPST rocker switch, Radio Shack, #275-693
Scoring knife (for plastic)
Single-hole paper punch
3-volt DC power supply--700 milliamp
1/4", 1/16", and 3/4" drill bits