No, that won't work. All the USB ports on a PC get their voltage from the same PC system power supply and all the USB ports share a common ground terminal so there would be no way to series them up. However you could build or buy a small DC/DC converter to generate whatever voltage you wished. Keep in mind that USB 5 volt power is limited to 100ma per port, unless a USB device communicates to the system's USB controller requesting more current and then may be issued a maximum of 500ma per port. 1/2 watt of power is not much to work with, useful for slow charging of batteries at best.I've got a thing going on at the moment, where I like to make USB powered things, but my problem is. Since USB is only 5v, would it be safe if I ran two usb cable and hooked them up in series to make 10v?
Thanks, Zac.