Amateur Science		Science Hobbyist Bill Beaty's science: amateur, cool, weird and other. Amateur Radiation Radiation detection and experimentation - Geiger counters, etc. Scanners LOMO discusses using scanners as a camera and microscope. Amateur science electronics Amateur science experiments, high voltage and GPS; several ways to kill yourself here. Amateur seismometer Fred Bruenjes' homemade seismometer - with data.
Inventors' Corner		Master Resource List Resources on patents, legal issues, start-up capital and other things of interest to inventors. Invention Dimension Resources for, about, and related to, invention. Resources for inventors Lemelson Center's resources for inventors and on the history of invention.
Surplus & Salvage		All Electronics Corp. Electronic and electro-mechanical parts and supplies. Alltronics Electronic components and equipment. MSIE ONLY!!! (Netscape hangs for me.) Surplus sources Bill Beaty's info on "Surplus Parts and Equipment for Amateur Scientists;" links to suppliers for electronics, optics, surplus, science and science education. DRC Distributors Tools, abrasives, etc.- surplus, closeouts, liquidations. Electronic Goldmine Electronics, robotics, hardware, test equipment. Marlin P. Jones & Assoc. Electrical, electronics, optics, hardware and more. Mark Hannah Surplus Electronics Electronics, fans, tools, etc. Sam's Gadget FAQ "Salvaging Interesting Gadgets, Components, & Subsystems." Follow the cautions: some of these gadgets can kill you. Sterling Resale Optics Lenses, mirrors, filters, etc. Surplus Sales of Nebraska Electronics & electrical items, incl. vintage electronics and parts.
Mechanical		McMaster-Carr Supply Co. A good start on building a factory: 390,000+ items of hardware, plumbing, materials, instrumentation... Small Parts, Inc. Specializing in small-to-mid scale parts, fasteners, material stock and tools.
Electronics		Online ElectronicCalculators Applets, and links to applets, for electronics calculations. LightEmittingDiodes.org LED (Light Emitting Diode) properties, design, physics, applications. Design Electronics W.D. Phillips' (partial) introductory electronics course. epanorama.net Lots of electronics information and links. CapSite 2002 A serious introduction to *real* capacitors. Fairchild literature Fairchild Semiconductor: includes some product manuals and brochures (e.g. the Logic Selection Guide) of general interest. Basic Electronics.COM Internet Guide to Electronics: theory, practice, components, message board, reference, links... Microphone FAQ Information for microphone users, compiled by Jeff Maggard. Tony's Website Tutorials on the LM741 op-amp, NE555 timer, PLL's, etc.; hobbyist circuits; useful links.
Electronics Data		Queen Mary Univ. of London Info on typical college lab components. Chip Directory Chip data, pinouts, links. ChipCenter / Questlink "The Web's Definitive Electronics Resource." ChipDocs "The online datasheet source for electronic components and semiconductors, especially for obsolete parts." Datasheet Locator Global Electronic Components datasheet locator; links to 750+ component manufacturers. Semiconductor Electronics Resource Center Links to datasheets, dealers, manufacturers. ePanorama.net "Search engines, electronics databases and link resources." FaradNet "The Capacitor Resource." Free Trade Zone Free datasheets on current parts. IC MASTER Online Information on IC's and other semiconductors. COMpSEEK! (Spanish) Short description of diodes and transistors by number. Fred's Electronics Links Links to datasheets, manufacturers and distributors. Chip and Semiconductor data CEDCC Component Database Server Penn. State Univsity's legacy guide to components and their identification, etc. Radio component database Component database for CB-radios and transmitter/receivers. Electrical & Computer Engineering Electrical & computer engineering links - Univ. of Delaware. Component Identification Tools Component identification, color codes, packaging, numbering conventions.
Electronics Dealers		Avnet Digi-Key Mouser Newark Pioneer Standard Distributor links Links to *many* electronics distributors on the web.
Electronics Mfg.		Fairchild Fujitsu - America Hitachi - Japan LITE-ON Optoelectronics Maxim Analog, mixed-signal, RF, wireless, fiber, power, microcontroller and communication ICs. Mospec Power transistors & diodes National ON Includes Motorola's former line of semiconductors. Philips SANYO SuperTex High voltage analog & mixed-signal semiconductors. Texas Instruments
Instrumentation		Rotameters Barnant Co. discusses rotameters and correction factors. pH Sensor FAQ Frequently asked questions about pH and pH sensors. Thermocouples Practical thermocouple technical information from ISE Inc.: temp. ranges, color codes, glossary, etc. Heat and temperature Links from Temperature World on heaters, temperature sensors, controls and instrumentation.
High-Tech Hobbyist		Microchip PIC embedded controllers: datasheets, applications, FAQ's. Nuts & Volts Magazine Bulletin board, resources and some on-line articles for robotics, microcontrollers, computer control, lasers. Parallel/Game/Serial Ports Links to information on PC and Mac ports and buses: parallel, serial , game, keyboard, PCI, ISA, GPIB, PCMCIA, etc. Project: RS-232 to TTL Cable Building a MAX232-based RS-232 to TTL conversion cable.
Motion Control		Electrical Motor Control Text and links related to motor control: AC motors, DC motors, servos, stepper motors and so on. Motion See the "Motion Control Buyer's Guide (TM)." PWM Motor Control Schematics Schematics for pulse-width modulated control of a DC motor.
Vintage Electronics		Antique Radio Classified For buyers and sellers of old radios and related items; incl. history, photos, archives and a huge list of links. Transistor History History and photo gallery of early semiconductors. Op Amp History "What's All This Julie Stuff, Anyhow?" Michelle's Electronics
Heat & Temperature		Heater technical info. Heater info. from HeatersPlus.com as PDF files: heat transfer, energy requirements, watt density selection. Heating element tech. info. Some practical info. and tips from National Element, Inc. regarding heating elements and alloys. Thermal Reference Data Watlow Electric's guides, tutorials and reference data for heater design: requirements; material properties; thermoelements.
High Voltage & Vacuum		High voltage, lightning, radio High Voltage Experimenter's Handbook and other materials. Neon Engineering, Inc. Not a fancy site, but it has some HV and other supplies that won't be at a hardware store. Check the map of other distributors.
Tools		Harbor Freight Tools Over 7000 tool and equipment items, with some real bargains. Micro-Mark "The Small Tool Specialists."
Safety		BioChemLinks: Lab Safety Biological, chemical, fire and lab safety resources. Vermont SIRI Safety information, links and MSDS sheets. Internet MSDS's Internet locations for MSDS's, plus FAQ's and other info. Legal Issues "Injuries in School/College Laboratories in USA."