This is a follow-up to this thread: https://arstechnica.com/civis/threa...-polarity-of-this-laptop-barrel-jack.1491071/tl;dr I have a laptop but no charger, and I'm ...

SCRs are the switching devices for this unusual DC to DC converter that is suited for the ubiquitous 5V USB power source as well as numerous other applications. This novel power circuit topology uses ...

The Zus USB 12-volt adapter not only includes two USB charging ports, it also automatically saves your parked car's location to your phone. Wayne Cunningham Managing Editor / Roadshow Wayne Cunningham ...

This is a 5V to 12V DC-DC step-up (boost) converter circuitry that is especially ideal for the USB powered applications. First of all a USB port has two current supply modes. Before detecting the ...

Charging your phone while you drive is sensible, especially if you use it for work. Many of the latest smartphones have fast-charge capability, but you’ll need a suitable USB adaptor to take advantage ...