Here's a project I had made utilizing a scrap toroid and some wire Using a 1k resistor, pn2222, 1w white led, AA battery, Two turns primary 18ga, two turns secondary 18ga, HV winding about 50 turns 28ga Wired the secondary and primary in the usual joule thief way, got about 130khz nearly square w…

joule thief tazer like device

karlboll August 24, 2012, 9:36am 3

He he he .. cool. Not very arduino-related though.

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