It’s a project called snapVCC, and it turns a 9 volt battery into a regulated 3.3 or 5 volt supply. The idea behind snapVCC is simple enough; just add a circuit board to the top of a nine volt ...

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 ...

While this can be done by direct connection with a multimeter ... clip so it can be run straight from the top of a standard 9 volt battery. It’s a circuit you’ll find all over the place ...