Transistorized from – PBS Online – Tutor
Lesson 2: Scientists at Work
Students select an electronic invention and research who and what contributed to it.
Lesson 4: Using Transistors
Students build circuits to see how transistors function as switches or amplifiers
These Tutors which are Interactive as well are useful for Students and Enthusiasts to enhance the Text Book reading.
Electricity and Magnetism – Molecular Expressions
These pages are good for any person who want to be more familiar with magnetism and electricity. This probably means everyone. Today Electricity Basics is General Knowledge and also an Absolute Essential.
Interactive Java Tutorials – Covers principles, physics, and devices used in electricity and magnetism.
Tutorial – Controlling The Real World With Computers
This site is for anyone who is the least bit curious about monitoring and controlling such things as motors, lights and switches, or recording and playing everything from sound to the arm position on a robot.
It’s for anyone who likes to learn by doing. You will not only read about controlling motors, lights and sound, you will control real motors, real lights, and really record and play information.
Mechanics and electronics DIY project. Information for Robotics and Small Machine Automation.
HobbyMechatronics – DIY Mechanics Robotics
Stellarium is free GPL software which renders realistic skies in real time with openGL. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope. Stellarium is also used in real planetariums.
Stellarium Open Source 3D Planetarium
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| From Linux and Lamp – Open Source Software |
Works with Linux, Mac OSX and Windows. There is also one that you can carry along with you – Stellarium at PortableApps
Celestia – The free space simulation
The free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X. 
Unlike most planetarium software, Celestia doesn’t confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy.
All movement in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A ‘point-and-goto’ interface makes it simple to navigate through the universe to the object you want to visit.
Celestia is expandable. Celestia comes with a large catalog of stars, galaxies, planets, moons, asteroids, comets, and spacecraft. If that’s not enough, you can download dozens of easy to install add-ons with more objects.
Bob Blick – Projects for Students
Servo Pulse to Dual H-Bridge interface performs vital control functions needed for propulsion and steering of a “fighting robot”.
LED Sign uses two LED arrays to form a 7 X 10 matrix. It produces moving messages or animations stored in an EPROM.
Oxygen Sensors. When they go bad your automobile runs poorly, learn about them and build a substitute for diagnostics or off-road use.
LCD Serial Terminal has RS-232 serial in/out, up to 20 programmable keys, Character LCD up to 2×40, 5 auxiliary inputs, 6 auxiliary outputs.
Ask Not What Bob Blick can do for you !
A Multimedia Tour of the Solar System by Bill Arnett.
The Nine Planets Solar System Tour
This website is an overview of the history, mythology, and current scientific knowledge of the planets, moons and other objects in our solar system. Each page has my text and NASA’s images, some have sounds and movies, most provide references to additional related information.
Other Astronomy and planets Sites
Hackaday – Breaking Gadgets and Equipment to learn how it works.
Makezine – DIY Magazine with New Exotic Hobby Projects to try at home.
Instructables – Many types of Home Hobbies with Detailed Instructions.
Here are some sample projects from them.
Recording Technology History 
1877 – Edison made the first recording of a human voice (“Mary had a little lamb”) on the first tinfoil cylinder phonograph Dec. 6 (the word “Halloo” may have been recorded in July on an early paper model derived from his 1876 telegraph repeater) and filed for an American patent Dec. 24. John Kruesi built this first practical machine Dec. 1-6 from a sketch given to him by Edison that was made Nov. 29 (not on “Aug. 12″ that Edison mistakenly wrote on another sketch in 1917).
When Kruesi heard Edison’s first words Dec. 6, he exclaimed “Gott in Himmel!” (but these words for “God in Heaven” were not recorded and thus have been forgotten). Others before Edison had tried to record sound, but Edison and his tinfoil phonograph were the first to succeed.
Apple Garage – Mac Ipod Iphone
” When he was in eighth grade, Steve Jobs, later the co-founder of Apple Computer, telephoned William Hewlett, president of Hewlett-Packard. “Bill answered, and I said, ‘Hi, you know, uh, I’m 12 years old and I’m trying to build a frequency counter,’ ” Jobs recalls. Hewlett, a symbol of entrepreneurial success in the Santa Clara Valley………” 
The company introduced the Apple II microcomputer in March 1977. A few years later, in 1983, it introduced the Lisa, the first commercial personal computer to employ a graphical user interface (GUI), which was influenced in part by the Xerox Alto.
Apple was founded on April 1, 1976 by Steve Jobs, Steve Wozniak, and Ronald Wayne to sell the Apple I personal computer kit. They were hand-built by Steve Wozniak in the living room of Jobs’ parents’ home, and the Apple I was first shown to the public at the Homebrew Computer Club. Eventually 200 computers were built. The Apple I was sold as a motherboard (with CPU, RAM, and basic textual-video chips) – not what is today considered a complete personal computer.
Hysteresis – Charles Proteus Steinmetz 
Charles Proteus Steinmetz (April 9, 1865 – October 26, 1923) was an American Mathematician and Electrical Engineer. He fostered the development of alternating current that made possible the expansion of the electric power industry in the United States, formulating mathematical theories for engineers. He made ground-breaking discoveries in the understanding of hysteresis that enabled engineers to better design electric motors for use in industry.
Charles Proteus Steinmetz electrical engineer
“Eickemeyer wanted to expand into electrical motors and generators, a brand new field in 1889.”
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