Step 1: Lets see the materials
the most difficult of them is the copper wire...in my country can be found in hardware stores in pieces of 2m each. If you can use anything else might be ok. ABout the RCA connector i will explain in farther step why we need them but if dont want them skip this material too.
Also you will need a bench press for manipulating the copper wire
All the construction costed less than 10 euro (14USD)
Step 2: Preparation Step1
The USB connector gives 5 volts in the outlet. The connection inside the connector is: see figures
About the RCA why we need them? Once you make this construction without the RCA if you need for an other reason the USB power then u have to built again from the start to find other USB connector and solderin and etc. Thats why i builted this instruction with cables sets that can be appart any time. The main cable is between the USB connector and the female RCA and the secondary cable from the male RCA to th lamb. Also i remember to use stanard polarity so the center of the RCA is Positive ALWAYS....