Discover how to build a simple electromagnetic motor and generator using everyday materials in this hands-on science ...

Discover how to create a homemade portable power generator using simple materials like DC motors, cardboard, and a USB wall ...

Hydrogen! It’s a highly flammable gas that seems way too cool to be easy to come by. And yet, it’s actually trivial to make it out of water if you know how. [Maciej Nowak] has shown us how to do just ...

Stepper motors are synchronous motors that step at the pulse rate of the driving signal. For the motor to move quickly, the stepping rate must be fast. However, because of motor and load inertia, the ...

This two-transistor white noise generator has a surprising feature – about 30dB more noise than the more traditional designs. Q1 and Q2 can be any small-signal transistors with a beta of up to 400.

A decent signal generator is handy for tuning electronic projects. [SC] sent in this AVR signal generator. The parts count is really, really low. An ATMega8 is the core, and a shift register runs the ...

Editor’s Note — February, 2026: We’ve checked the products in this story to make sure they are still in stock and available. We also included a new edition, the EcoFlow Delta Pro Ultra X, for which we ...