$2 Cassette Box Cellphone/USB Charger

Step 4 Hot Rod It!

I took it a step further by adding an LED with a 1K ohm resistor attached to the positive LED pin, and soldered the LED to pins 2 and 3 of the regulator. This would serve as a nice indicator light to show that I had the polarity correct on the alligator clips before plugging anything into the USb port, which I also mounted inside the cassette case. I finished the whole thing off by making a custom case cover in Photoshop and printing it out on a sheet of photo inkjet paper, which I then cut down and glued to the top!