Sure you could go buy a USB charger off the shelf, but what fun would that be? Try making one yourself with a little help from a 9V battery and a few extra components. This simple hack on a standard ...

My portable charger is probably the most useful piece of technology I carry with me, other than my phone. I am terrible about remembering to charge my phone until I’m stuck on a delayed subway at 7PM ...

This is a simple circuit diagram of 9V battery charger circuit using SCR and LM311. This is a simple circuit diagram of 9V battery charger circuit using SCR and LM311. The principle behind the circuit ...

CLEVELAND -- Stranded on the side of the road with a dead car battery and a dead cell phone? Not if you keep a 9-volt battery handy in your glove compartment. It's possible to revive a dead cell phone ...

If you’re looking for a neat DIY project this weekend, then this DIY 9V Battery USB charger could be a fun gadget to create. With only a few components, including a 9V battery, a female USB port from ...