सिर्फ ₹20 मे बनाओं speed controller module | How to make 12 volt speed controller 

सिर्फ ₹20 मे बनाओं speed controller module | How to make 12 volt speed controller
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In this video I made 12 volt speed controller module using FR207 diode, 5 volt Potentiometer, 1K resistance, 2 volt LED
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