The aim: Create a 3.3V source from a –5V supply. You can obtain a precise, positive-output voltage from a negative-voltage supply with a boost converter and a linear regulator. The input and output ...

The positive and negative terminals are foundational to how a battery works, but the terminals don't necessarily need to be opposite of each other.

Car batteries last for years, but every car battery shows signs that it needs replacing or a jump start. It has happened to all of us. We've been at the grocery store, packed up our car, and then we ...