~ Early Web Links ~

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.

Robert Smathers maintains this personal hub dedicated to TVRO (Television Receive Only) satellite reception, featuring links, schedules, mail lists, newsgroups, and dealer resources for satellite hobbyists. The site also touches on visual satellite observing and space topics, making it a useful reference point for backyard dish enthusiasts.

AimSpice appears to be a SPICE circuit simulation software site, offering tools for electronic circuit analysis and modeling. The minimalist page redirects visitors to the main document, suggesting a focused software or technical resource for electronics engineers and hobbyists.

The EE Compendium is a comprehensive reference hub for electronics engineers, students, and hobbyists covering microcontrollers, embedded systems programming, and hardware development tools. Visitors will find curated links and resources spanning popular platforms like Atmel AVR, Microchip PIC, Intel 8051, and Freescale chips, along with project kits, robotics, software compilers, and career resources.

RF Cafe is a comprehensive resource for RF and electronics engineers, offering formulas, reference data, vintage magazine archives, software tools, forums, and a massive parts and services directory. Running since 1996, the site blends technical depth with nostalgia, featuring scanned articles from classic publications like QST, Popular Electronics, and Radio-Craft alongside modern engineering utilities.

ChaN's personal electronics engineering site showcases hobby projects, technical notes, and software tools shared with enthusiasts worldwide, including the widely-used FatFs filesystem module for embedded systems. The site blends circuit designs, fluorescent lamp ballasts, and downloadable code under a Creative Commons license, making it a genuine resource for hardware hobbyists.

WhiskeyTangoHotel.Com is a hobbyist electronics and amateur radio blog featuring hands-on projects like ESP32 microcontroller builds, temperature logging with Node-RED, and Morse code analysis tools. The site blends practical hardware tutorials with radio operator interests, making it a great find for tinkerers who enjoy cheap microcontrollers and DIY data visualization.

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.

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.

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.