Off-Topic: use laptop only as USB power supply

Michael Holstein michael.holstein at
Fri May 21 13:48:47 UTC 2010

> I only need voltage on the USB ports.

Voltage won't be a problem .. current will be.

By default, USB supplies 100ma of power. To switch into "high-power"
mode (500ma) requires the device and the host agree on doing so.

If you're at all handy with a soldering iron, this is a fun project to
do what you need :
There are also any number of commercial devices that can do universal
voltage (100-250v 50/60hz) to 5v USB that are barely larger than a


Michael Holstein
Cleveland State University

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