Can I make a "universal" USB to DC adapter?
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I understand that 5V/500mA is the maximum voltage/current rating for a USB port. Can I splice together two cut usb cords and create a pseudo universal DC adapter with the other half connected to the DC end of a AC/DC universal adapter? This way I get 10V/1A? I can envision a circuit with a switch, and each wire in the parallel circuit having a different resistor to lessen the voltage to between 4.5 and 9v. Is this plausible?
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Answer:
No. It would take too long to explain the electrical theory here, but it just does not work like that. You could use a DC to DC converter if you wanted to increase the voltage, but increasing the voltage would also limit the current available (basic Ohm's law). Put bluntly, there's NO WAY you're going to get 10V DC at 1 Amp from a single USB socket. 10V DC at 150-200mA might be possible, given a DC-DC converter of suitable specs.
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Other answers
You cannot connect USB ports in series, since they are the same 5V supply. When you connect the positive on one to the negative of the other, it will simply short out the port. You can, in theory, parallel them for 1A current, at 5V.
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