DIY Polarity Tester positive negative finder

DIY Polarity Tester / positive negative finder

Materials Required:

1. Old Bolt point Pen Transparent
2. 2mm copper wire
3. 3K Ohms resistor
4. Red & Green LED
5. Alligator Clip
6. Wires

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Видео DIY Polarity Tester positive negative finder канала LahisTech