In the desktop 3D printing world, we’re fortunate to have multiple online repositories of models that anyone can load up on ...

Many people experienced sleeping well in natural surroundings, into a tent or a wooden hut. This fact is due not only to the healthy atmosphere but also from our unconscious ability to perceive ...

The basis of almost everything we discuss here on ExtremeTech is the transistor -- but just above that is a topic that we usually skirt around because no one, even hardcore nerds, really know anything ...

When looking for things to write about, there is nothing we like to see more than well-documented schematics and code available for download. In the case of schematics, we realize that they can be a ...

Beeps when hears your whistle, A gadget suitable for key-holders, games etc. Some 20 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its ...

Maybe my Google-fu sucks, but I've been having trouble locating good circuit design software that doesn't cost an arm and a leg. At the moment, I'm mostly just interested in something that will help ...

In this circuit, a MOSFET protects a reverse-connected battery from excessive current. The MOSFET conducts only when the battery is correctly connected, which lets the battery charge or discharge. In ...

HB (high-brightness) LEDs require a large amount of current to operate. When driving HB LEDs from a voltage source, you can set the required current with a suitable series resistor. If the voltage ...

Chaotic circuits can arise from either computed (using Analog Computers or Digital Computers) solutions to coupled differential equations or from unstable systems/circuits. A new open-source circuit ...