This is Simple USB polarity and data activity tester
This is very easy to make circuit ..
2X 1/4 or 1/8 W 1K ohms resistance.
1X RED LED
1X GREEN LED
1X BLUE LED
1X General PCB
1X USB Male Port
1X OLD USB Drive Case
How to Test.....
Green LED ON >>Polarity OK
Red LED ON >>Polarity Reversed
Blue LED FLICKERS >>DATA Port OK
NO LED ON PORT DEAD OR DISCONNECTED
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