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here is the usb powered version, i will also post a radio shack parts list with this one.
for usb power, add the red and black of usb cable, if your serial port dont put out evough power
heres what you need for a laptop, and thes gouys are good and ship quick.http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=3141