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1 5.1v zener diode
1 330-ohm resistor
1 9v battery connector
1 9v battery
solder and soldering iron
1. Solder the Zener diode to the left and right USB connector prongs.
2. Solder the black wire of the 9v connector to the left prong and the right wire to the resistor.
3. solder the other end of the resistor to the right prong.
4. Hook up battery and go to town.