Hobby Electronics, Do it Yourself Projects, Audio, Video, Home Gadgets, DIY.
Radio Controlled Modeling and PIC 
PIC Assembler Projects, PIC Assembler Modules, Electronic Circuits, Student Projects, R/C Modeling Circuits, Servo Checker.
Peter Luethi - Switzerland
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)
Electronic Circuits Projects Diagrams
Forum, Chat, Community, Post questions, Solve Problems. Robotics Chat, Micro Controllers, Electronic Projects,
"I was born in the late 1970s, mid-year in the local hospital of a coastal part of Australia? Yet another instance of humanity, one of the 6.6 billion or so of us (4.2 billion back then). Doomed like all of us to live out their days on this rock with some clinging gases orbiting a minor star in a relatively quiet part of the local cosmic clump of matter."
Alan Yates
Engineering Calculators
One Transistor Voice Transceiver - Building a toy VHF phone transceiver for 3 metres using only one transistor for both TX and RX!
MK484 MW Receiver - A fairly small MK484 based receiver for the AM broadcast band.
40 Metre Spectrum Analyzer - My go at making a JF1OZL-style spectrum analyser for 40 metres.
Nano-Henry Inductance Meter - My implementation of Drew Diamond VK3XU's "Nano-L", plus how I constructed and trimmed my calibration inductances.
Fly Electric-- Radio Controlled Model Aircraft
This site is for flyers of Radio Controlled model aircraft wanting to find out about successful Electric powered RC modelling. 
"On this site I showcase big electric planes, have loads of free plans for smaller ones, cover many interesting contruction topics and provide circuit diagrams and advice for lithium batteries."
- David Theunissen
PIC and C for Beginners Designing PIC microcontroller-based devices to monitor lithium voltages. Individual cell low voltage cutoff, lithium tester and servo controller circuits. Simple data logging. Tutorials to help beginners to get started.
PIC projects for working designs.
Lithium batteries; what makes them tick, huff and puff. How to look after and charge them. Free DIY charger and balancer circuits.
DIY brushless motors If you are keen to experience greater than 2:1 power to weight ratio on simple conversions or demanding machining challenges on more complex motors.
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