These models juice up your refrigerator, air conditioner, and other essentials during an emergency—no matter what.

Whether it’s a hurricane, an ice storm, or even a wildfire, power outages seem to be happening more often and in more places. Maybe you’re thinking about buying a generator to keep the juice flowing.

Previously-known schemes for RC rectangular pulse generators with a regulated duty cycle had an ineradicable disadvantage: changing the pulse fill factor (D) inevitably changed the frequency of ...