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Turn any fixed voltage adapter to variable voltage output (3v - 25v)
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Convert 5v Mobile Phone Charger to 3- 18v Adaptor -ADJUSTABLE #Mobile_Charger #5v_to_3V-18V
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A Simple Trick to Get Variable Voltage from Any Fixed Output Power Supply!
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Don't throw away Old Batteries!Genius Invention with Welding Machine that you won't Believe😱
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