Learn how to create a reliable 12V battery backup circuit for routers, LED lights, or small electronics. This step-by-step tutorial is perfect for DIY electronics enthusiasts and beginners alike ...

Figure 1 Simple circuit to indicate a low battery. For this application, the LED proved to be a decent reference diode. It has a temperature coefficient that tracks fairly well with that of Q1, and ...

What you need: 3 crocodile-clip wires 9V battery LEDs Assorted resistors Asparagus THE candle. It is a simple technology, and a good one. The electronic version is also simple to make, and is a ...

Using just a magnet, a battery, a nail and a piece of copper wire, this is the simplest electric motor you can make, says Alom Shaha, but it is utterly delightful and children will love it ...

This electric motor is fairly simple to build and uses materials that you can probably find around the house.