Joule Jar Lantern
The batteries of your tools are not yet empty?But the flashlight doesn't work any more? No problem - with the Joule Thief!What is a joule thief? This is a tiny circuit allowing you to operate a white or different coloured LED from a low voltage. For driving a LED you normally need 3-3.5 V, as from a...
By: schaude
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By: schaude
Continue Reading »
from Instructables: exploring - featured http://ift.tt/2qUkE7n
via IFTTT