Taking power from USB port

Power-supply circuit operates from USB port article mentions some useful points on using USB connector as power source as well as gives an useful circuit diagram. You can use a USB port to power an external circuit. Even one without any USB functionality in it. Every PC has a USB (Universal Serial Bus) port that

Power Everything with USB

9 Kick-Ass DIY Projects to Get Your Hack On article on web site starts with instructions how to alter a non-USB gadget so that it can be run off of USB power from your computer. The article shows you how to use USB to power a desk fan and book-light lamp.

USB3 and Linux

Combining 5 Gbps with the convenience of USB sounds like a sure win. The idea is is simple. Just start with widely used, fast, and bulletproof USB 2.0 and put in the PHY (physical-layer) interface from another common and reliable standard, PCIe (peripheral-component-interconnect express) Generation 2. Put two extra differential pairs into the USB connector

USB 3.0 is coming

Register Hardware has just published Inside USB 3.0 article on new coming USB 3.0 technology. USB 3.0 is sometimes called SuperSpeed USB because of its 5Gb/s peak data-transfer rate. NEC announced first host controller chip for USB 3.0 last week. Achieving that 5Gb/s data rate has required some hardware changes because simply can’t do SuperSpeed