Its a very simple LED torch using very easily available components. This torch costs you about 0.6$ and lasts for 50 hrs(approx). components required are: 1).Hinged lockable plastic box. 2).Simple Switch 3).9 volt Battery 4).100 ohms resistor 5).8mm LEDs(we need a couple of them).........any type of LED can be used but carefully select the resistance value. 6).soldering equipment.
step 1one and only one step!
Make suitable dents in the box such that we can fit the switch and the two LEDs. longer arm of LED is + and shorter one is - connect longer arm of LED to + terminal of 9…
step 2
i wanna thank Vigyan Aashram Pabal, india. and Aravind Gupta Sir.
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http://www.instructables.com/id/Low-Cost-LED-torch-it-lasts-50-hours/