Need something that can quickly charge a Macbook with a USB cable. Would like a more flexible adapter that has additional ports and such. I want a standard USB connector on the power brick itself. It ...

When Apple abandoned the Lightning connector in favour of USB-C a couple of years ago, many people cheered, not least in the ...

If you’re like us, you probably have a box (or more) of wall warts lurking in a closet or on a shelf somewhere. Depending on how long you’ve been collecting cell phones, that box is likely overflowing ...

Chances are, you have some old mobile phone chargers lying around the house with non-USB pins. Instead of junking it, Martin Melchior shows us how to attach USB ports and give those chargers a new ...

We may receive a commission on purchases made from links. USB-C is the new darling of both mobile and computing industry because of how it can be (almost) everything for any need. And you won't have ...

The circuit below will trickle charge a four cell pack of AA or AAA NiMH batteries. The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery.

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 ...