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 ...

9V batteries are often found in devices that aren’t used very often. If you use a NiCd rechargeable battery you may find it completely discharged by the time you need it. Capacitors on the other hand ...

Building a portable lamp with a 9V battery and LED bulb is a simple, creative DIY project that anyone can try. This video provides clear, step-by-step instructions for assembling a functional lamp ...

Wii sensor bar (in case you trash yours or want a spare): $10 Those in hand, the folks at the AVS forum tell us it's as simple as cutting, crimping, and plugging. Voila! A do-it-yourself wireless Wii ...

It’s pretty creative to use a 9v battery as an enclosure. That’s what [Osgeld] did when building this amplifier. There are several advantages; they’re easy to find, it keeps a bit of the dead battery ...

After holding the connection for approximately 1 minute and 30 seconds, the adhesive should debond, allowing you to remove the battery with a suction cup tool. If you can’t remove the battery, you ...

This Design Idea describes a 9V battery-voltage monitor whose total parts cost less than 34 cents (Figure 1). You configure transistor Q 1 as a 10-mA current sink. LED 1, a Kingbright WP7104IT, is on ...