make a low cost desk LED lamp

Step 3: Preparation Step 2

Now we take a pair of cables (black and RED) of equal resistance and lenght, lets say about 1m or longer its depends of your needs. If we make the cables with RCA then you cut the 1/3 of the initial pair and connect the to the USB connector and the other end to the female RCA. Its a good tactic always using the same polarity protocol in your connectors...For me the center of the connector RCA is Positive so the other is negative. Now after the soldering please use some friction tape to Insulate the naked parts of the cables. Even better you may use some thermal cables that covers any naked part (i dont know the exact name in english)