Why is that you always test 48 bulbs before you find the bad one in a 50-light string?
This simple circuit allows you to divide and conquer, greatly reducing the time it takes to find the bad bulb.
This article originally appeared on EDN.
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Complete with build instructions for the design engineer who likes the silly side of inventing things and enjoys building stuff in his and her spare time, these gadgets range from highly silly and impractical to extraordinarily inspirational for your own engineering design work.
Why not submit your own pride and joy for publication in Gadget Freak? Send us your project details here.
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Simple Christmas-tree lights tester
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