MacGyver Tip: Turn a C battery into a D with quarters

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h@ker

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You need a D battery but all you've got laying around are C cells. Since C and D batteries are both 1.5 volts (they differ only in size and energy storage), you can build a makeshift D to C "adaptor" with a few regular, conductive, George Washington quarters. Just insert them into your gizmo as pictured and you're good to go. Photo by L. Marie.
Quick hack: The $1 C-to-D adapter [Evil Mad Scientist Laboratories via Hackszine]
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