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Calculator City, calculators for algebra, geometry, trigonometry, calculus, finance, astronomy, physics, chemistry, time cards, HTML Colors, percentages, fractions

DIY Audio Projects documents several DIY HiFi audio projects for Audiophiles. Projects include vacuum tube amplifiers, gainclones (chip amps), mosfet amps, preamplifiers, loudspeakers and audio cables.

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wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

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How transistors work and how to test them, explained with the minimum of maths. Animations, Quiz, Downloads and links to electronics sites worldwide.

The Physics Classroom is an online interactive tutorial of basic physics concepts. The lessons use an easy-to-understand language to present common physics principles discussed in a first-year high school physics course.

The goal of this free online learning center is to help high school students prepare for comprehensive exams in English, math, global history, U.S. history, earth science, biology, chemistry, and physics.

Car audio technical information with more than 125 individual pages, 50+ calculators and wav files. The covered topics range from basic electronics theory to more advanced topics such as speaker impedance as it relates to frequency, damping factor a...

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