Although we increasingly live in a world of portable, rechargeable gadgets—not to mention a world increasingly traversed by battery-powered cars—there are still wide swaths of our lives that are ...

Here is a simple heater circuit that can be operated from a 12V battery. The first part of the circuit is an astable multivibrator build around the two transistors Q1 and Q2 . The ON time of ...

Imagine that your major home appliances run on batteries. Using regular cords that plug into standard 120-volt outlets, the appliances charge themselves when power is cheapest and store enough energy ...

Anthony DeVito, 37, grew up in central Michigan, farther north than both Chicago and Detroit. After attending college in the state, he spent another 10 years working in construction and engineering, ...