Hobby Electronics, Do it Yourself Projects, Audio, Video, Home Gadgets, DIY.
Flinn Scientific - Science Activities
Sells educational science supplies. Site has especially useful information on lab safety and lab design.
Physical Science Activities - Exciting experiments which illustrate important scientific concepts and are exciting for both you and your students
Periodic Table and other Calculators
Periodic table of the elements contains the basic data about the elements in five languages. 
EniG. Chemistry Assistant 2.4 An expression calculator for fast calculation of molecular weight of compounds by simple entry of chemical formula (the element symbols can be written in lowercase letters). The calculator also provides a list of common physical constants and performs various conversions between English and metric units.
Scientific calculator Sci.Calc is a fully-functioning JavaScript calculator that contain of practically any common and many advanced calculator functions (cosine, sine, tangent, power, square root, exponents, etc.).
Learning Electronics by Hobby DIY is not Complete without a sound Knowledge of Materials, A Periodic table Reference will help in Understanding the Metals and Semiconductors.
Every Metal has a potential for a New Component Discovery, Even a Breakthrough in SuperConductivity at Room Temperature will change the way we build Gadgets !
Anantha Narayan -delabs
Electronics Concepts at HyperPhysics
HyperPhysics is an exploration environment for concepts in physics which employs concept maps and other linking strategies to facilitate smooth navigation. For the most part, it is laid out in small segments or "cards", true to its original development in HyperCard. The entire environment is interconnected with thousands of links, reminiscent of a neural network..
(Students should go thru this website from cover-to-cover, It is a work of knowledge that is priceless - ananth)
Miami Museum of Science and Planetarium
This resource contains educational activities about energy concepts, the power of the sun, energy conservation, energy transformation, electricity and fossil fuels being presented by famous gothic horror characters.
Science Hobbyist
Amateur Science, Cool Science, Gravity, Energy, Fusion, Tesla Coil Page. Neodymium Supermagnets, Science Toys. Significantly Worthwhile Books, Science Fair Ideas, Science Demos Articles, Experiments, Exhibits, Kids' Science Projects, The Science Club. See also Electronics Hobbyist.
