2026-07-07 Graphite Page by John A. Jaszczak John A. Jaszczak, a physicist at Michigan Technological University, has compiled a comprehensive reference on graphite mineralogy covering crystal structures, properties, spirals, spherical forms, and notable localities from around the world. The site features atomic force microscopy images, links to published research papers, and detailed documentation of unusual graphite occurrences including cones, pseudocubes, and meteoritic graphite.
2026-07-07 Home Page The PALEOMAP Project, run by Christopher Scotese, is a comprehensive scientific resource illustrating the plate tectonic development of Earth's ocean basins and continents over the past 1.1 billion years. Visitors can explore full-color paleogeographic maps, interactive 3D PaleoGlobes, animations of ancient Earth configurations like Pangea, and download materials for geology education.
2026-07-07 Le Regne Mineral French mineralogical magazine: Le Regne Mineral is a French bimonthly mineralogy magazine covering earth sciences with original articles and high-quality mineral photography from renowned specialists like Jeff Scovil and Mick Cooper. Considered one of the top five mineral magazines in the world after four years of publication, it serves collectors, rockhounds, and mineralogy enthusiasts across Europe and beyond.
2026-07-07 Main menu, I-170 Pennsylvanian exposure (Altamont Formation) Professor of Geology Norman R. King documents the Pennsylvanian-age rock exposure uncovered during I-170 highway construction in St. Louis, Missouri, with detailed photographs and technical discussion of the Altamont Formation. This site is a niche academic resource for geology enthusiasts and paleontologists interested in Carboniferous stratigraphy and fossils from the American Midwest.
2026-07-07 Maryland Geological Society The Maryland Geological Society is a non-profit club founded in 1991 for amateur and professional fossil and mineral collectors, open to all who share a passion for the geological sciences. Visitors will find meeting schedules, field trip announcements, fossil and mineral FAQs, a gallery, newsletter archives, and articles by contributing scientists.
2026-07-07 Mineral Webzine Mineral Webzine is a bilingual French-English non-commercial online magazine dedicated to rockhounds, mineral collectors, and geology enthusiasts. Featuring photographs of specimens like garnet, wulfenite, and cinnabar contributed by collectors from Canada and France, it serves as a reference for mineralogy, crystallography, and gemology.
2026-07-07 Mineralienatlas - Fossilienatlas Mineralienatlas is a comprehensive German-language encyclopedia and community platform covering mineralogy, geology, paleontology, and mining, supported by thousands of members worldwide. Visitors can search minerals by chemical properties, browse fossil and mineral portraits, explore collecting locations, and dive into crystallography and systematic mineralogy.
2026-07-07 Mineralogy Database Webmineral is a comprehensive mineralogy database created by David Barthelmy, cataloging 4,714 individual mineral species with detailed descriptions, crystal structure viewers, X-ray data, chemical formulas, and an extensive image library. Its interactive Java-powered crystal viewers, searchable indexes across dozens of physical and optical properties, and multi-language support make it an invaluable reference for geologists, collectors, and mineral enthusiasts alike.
2026-07-07 NAGS NAGS (Norske Amatørgeologers Sammenslutning) is the Norwegian association for amateur geologists, offering a comprehensive lexicon of Norwegian minerals, an index of articles from their geology magazine STEIN dating back to 1973, and listings of geology clubs across Norway. Visitors interested in rocks and minerals as a hobby will find this a rich hub for Norwegian earth science resources and community.
2026-07-07 Nickel-Strunz Classification Webmineral.com presents a comprehensive reference for the Nickel-Strunz Classification System, organizing over 4,700 minerals into a systematic hierarchy of chemical groups from elements and sulfides to silicates and organic compounds. Built with contributions from mineralogist James A. Ferraiolo whose classification scholarship dates to 1982, the site serves as a serious database tool for mineralogists, crystallographers, and collectors.
2026-07-07 Rocks and Minerals for Earth Science Fun Rocks and Minerals 4U is a comprehensive educational resource covering geology topics including rock formation, mineral identification, plate tectonics, and the rock cycle, with dedicated pages for igneous, metamorphic, and sedimentary rocks. Designed for collectors, students, homeschoolers, and teachers, the site offers lesson plans, crossword puzzles, photo galleries, and even a shop for rock and mineral specimens.
2026-07-07 The Mineralogy of Nova Scotia - Welcome Created by Ronnie Van Dommelen, this site is a dedicated reference guide to the mineralogy of Nova Scotia, Canada, covering locality information, mineral images, species studies, and reported minerals from the region. It highlights the province's world-class zeolites, Bay of Fundy collecting sites, and serves as an online resource for mineral enthusiasts and collectors worldwide.
2026-07-07 Virtual museum with photographs illustrating thousands of mineral specimens from worldwide localities. John Betts built this extraordinary virtual mineral museum housing over 194,000 photographs of more than 63,000 mineral specimens from localities around the world. With educational articles, field trip guides, searchable species and locality databases, and decades of collector expertise behind it, this site is an unparalleled reference for mineralogy enthusiasts.
2026-07-07 Wasser-Wissen - Das Internetportal f�r Wasser und Abwasser Wasser-Wissen is a German-language internet portal dedicated to water and wastewater topics, featuring an A-Z encyclopedia, news, link directories, legal references, and resources on water management and environmental systems. The site covers everything from chemical elements relevant to water chemistry to sewage treatment plants, court rulings, dissertations, and international water management organizations.
2026-07-07 Welcome to CORDELL EXPEDITIONS Cordell Expeditions is a site dedicated to exploration and expedition activities, likely covering adventures, field research, or scientific trips into the natural world. The name and framing suggest a group or initiative organized around outdoor discovery and expedition-based work.
2026-07-07 rfchoke.com A technical reference site dedicated to RF chokes, ferrite cores, and related radio frequency electronics components used in amateur radio and RF engineering applications. Visitors will find practical information on choke design, impedance characteristics, and suppression of common-mode currents on antenna feedlines.
2026-07-07 4QD-TEC Electronics Circuits Reference Archive Index: Created by Richard Torrens, founder of 4QD Ltd, this extensive archive covers a wide range of electronics circuits and design information, from audio and motor control to oscillators and power supplies. Built originally as a subscription club and now freely accessible, it emphasizes discrete component design for a solid grounding in fundamental electronic principles.
2026-07-07 A Collection of Smith Chart Resources A comprehensive reference hub dedicated to the Smith Chart, the classic RF engineering tool invented by Phillip Smith of RCA, covering tutorials, software downloads, example charts, reference books, and curated links to related tools and pages. Visitors can explore the mathematical foundations of impedance matching, s-parameters, and microwave design through a well-organized collection of articles, Java applets, and PDF resources.
2026-07-07 A Collection of Smith Chart Resources, page 2 SSS Online is a long-running RF and spread spectrum engineering magazine offering deep technical resources on Smith charts, S-parameters, impedance matching, Eb/N0, and link budgets. Managed by Pegasus and active since 1995, it serves RF engineers and ham radio enthusiasts with articles, software downloads, tutorials, and reference material on microwave and wireless design topics.
2026-07-07 Alan Yates' Laboratory - Latest Articles Alan Yates (VK2ZAY) runs a sprawling electronics and amateur radio laboratory notebook covering homebrew circuits, microcontrollers, high voltage experiments, pyrotechnics, antennas, and much more. With over 260 articles, engineering calculators, and an annual Advent Calendar of Circuits series, this is a genuine treasure trove for hands-on electronics hobbyists.
2026-07-07 Bitstream Technologies, Inc. - Other Electronic Resources Bitstream Technologies curates an extensive directory of electronics resources spanning circuit archives, DSP tools, embedded systems, robotics, PCB design, and IC information. A well-organized link library for engineers and hobbyists, covering everything from FPGA design tools to repair and test equipment references.
2026-07-07 Circuit Sage New Routine of the Week: Circuit Sage offers free design routines and tools for analog and RF circuit engineers, covering topics like PLL design, LNA/PA design, impedance matching, bandgap references, and transmission lines. The site provides Mathcad-based calculation routines that serve as practical references for IC and wireless circuit design work.
2026-07-07 CircuitsArchive CircuitsArchive is a free, web-based archive of electronic circuit schematics covering everything from audio gear and battery monitors to filters, telephone interfaces, and microprocessor circuits. Maintained by Nicola Asuni since 1998, it offers a well-organized collection of PCB designs and projects useful to hobbyists and engineers alike.
2026-07-07 cryothene Cryothene is a technically-minded personal blog covering electronics projects, embedded systems, reverse engineering, and 3D printing, with standout documentation of a custom display driver project called Sharpie spanning many installments. The site also mixes in anime opinions, game reviews, and occasional recipes, but the dominant draw is its detailed hardware and microcontroller writeups.
2026-07-07 DiscoverCircuits.com started in 2002 Free Electronic Circuits DiscoverCircuits.com, run by engineer Dave Johnson P.E., is a massive repository of over 45,000 free electronic circuits and schematics cross-referenced across 500+ categories for engineers, hobbyists, inventors, and students. Online since 2002, it serves as a go-to reference for quick design ideas, circuit solutions, and component resources covering an enormous breadth of electronic applications.
2026-07-07 DIY Guitar Effects Pedals, Schematics, Stompboxes & Electronics Jack Orman's AMZ is a deep well of DIY guitar effects pedal knowledge, offering free schematics, project guides, a lab notebook, and a blog covering circuits for fuzzboxes, boosters, overdrives, and more. With decades of content, PCB boards for sale, and downloadable ebooks, it stands as one of the most comprehensive stompbox electronics resources on the old web.
2026-07-07 DMX512.com - The source for theatre technical information DMX512.com is a technical reference hub dedicated to entertainment technology, covering stage lighting, audio, communications, MIDI, show control, and power systems for theatre production. Named after the DMX512 lighting control protocol, the site organizes resources across multiple categories including net resources, reference materials, and even accident reports relevant to technical theatre professionals.
2026-07-07 Don's homepage! Don Klipstein's sprawling technical resource covers everything from LEDs and fluorescent lamps to Tesla coils, xenon strobes, lasers, and high voltage experiments. With decades of accumulated hobbyist knowledge, detailed guides, and regularly updated content, it's an indispensable reference for electronics enthusiasts interested in lighting and discharge lamp technology.
2026-07-07 Electronic Circuits Aaron Cake's extensive collection of electronic circuit schematics covers categories from power supplies and light/laser projects to telephone circuits and sound/radio designs. Each circuit includes printable PCB patterns, community rankings, and user comments, making it a hands-on resource for hobbyist electronics builders.
2026-07-07 Electronics - Mobile Friendly A comprehensive free electronics and electrical engineering reference hub covering everything from basic electricity and Ohm's Law to advanced RF design, DSP, amateur radio, and circuit simulation. With hundreds of curated links, formulas, tutorials, data sheets, and calculators organized across multiple phases of learning, it serves as a structured self-study guide for electronics enthusiasts and engineers alike.