Group items tagged

"Many might be alarmed to learn of a homemade nuclear reactor being built next door. But what if this form of extreme DIY could help solve the world's energy crisis? "

"Greetings citizen scientists, budding biohackers, and backyard explorers! We think you'll find the Make: Science Room a fun and useful resource. We hope you'll use it as your DIY science classroom, virtual laboratory, and a place to share your projects, hacks, and laboratory tips with other amateur scientists. Your Make: Science Room host is Robert Bruce Thompson, author of Illustrated Guide to Home Chemistry Experiments: All Lab, No Lecture. (Make: Books, 2008) and Illustrated Guide to Forensics Investigations: Uncover Evidence in Your Home, Lab, or Basement (not yet published). We'll be drawing material from these titles first, but will soon branch out into biology, astrononmy, Earth sciences, and other disciplines."

In a perfect world, you could enjoy great sound by installing just four full-range speakers - one in each corner of your car. In the real world, things aren't quite that easy. Full-ranges simply aren't up to the task of accurately reproducing the entire music spectrum. That's why top-notch systems employ two or more component speakers - like a woofer and tweeter - per channel. Each component is designed to reproduce a specific range of frequencies, and together they can cover the entire music spectrum accurately.\n\nA complication arises, however, since source components such as CD players deliver all of these frequencies - low, high, and in between - as a single music signal. This is where crossovers come in. A crossover divides the music signal into frequency bands that are compatible with the different types of component speakers.

Want to see a real sugar high? Launch a model rocket with Oreo cookies

An Australian high voltage site with 200 projects

"Building your own 2 Way/3 Way Passive Crossover Networks"

While there are many articles elsewhere that discuss passive crossover design, not all follow a scientific approach. There are several 'off-the-wall' designs scattered throughout the Internet that are a case in point, and unless there is real science described in any article you see, it is best avoided.

"A passive crossover has no active filters as were used in the electronic crossover. It uses coils (inductors) and capacitors to cause a rolloff of the audio level."

"Passive Crossovers, Low Pass, Bandpass, Highpass Filters"