the entire directory only in Reference/Circuit_Archives

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• 40W No Tune FM Broadcast - Power Amplifier Design.
• 555 Timer Tutorial - An extensive tutorial on 555 timer (history, timing and logic diagrams, replacement guide).
• Bowden's Hobby Circuits - A collection of electronic circuits for the hobbyist or student, links to related sites, commercial kits and projects, newsgroups and educational areas.
• Building Gadgets - A collection of electronics projects, circuits, datasheets, and helpful articles from the authors of "Electronics Projects For Dummies".
• Butterworth Low-Pass Filter - Design of a 5th order Butterworth LP filter using Sallen-Key circuit design.
• CXI Schematics - Schematic index: audio, RF, power, switching and miscellaneous circuits.
• Circuit Cellar Archive - Nearly every issue is listed from 1988 to 2001, software code.
• CircuitDB - A searchable database of schematics and electronic circuit designs such as alarms, audio/video, auto, etc.
• Circuits Archive - ASCII circuit diagrams, radio, audio and computer related circuits; data sheets.
• Circuits Today - Collection of circuits built around specific components and functions
• CircuitsArchive - A Wiki-based archive of electronic circuits for hobbyists.
• Closed Caption Decoder - A simple closed caption decoder for your TV. Schematic, BOM, theory of operation.
• Computer Circuits 200 A - A web-based course on designing and troubleshooting digital systems, primarily microcomputer based. Covers basic digital logic circuits.
• CoolCircuit - Electronic circuits, projects, schematics, and software for hobbyists.
• Delabs Electronic Schematic Diagrams - Electronic circuit archive, FAQ, freeware, resources directory.
• Digital Clock - Easy nixie clock with different microcontrollers.
• Discover Circuits - A collections of categorized and cross-referenced electronic circuits or schematics.
• EDN Archives - Online magazine articles consist of information about circuits, software programs, listings and helpful tips.
• Electro Tech Electronic Projects - An electronic forum. Includes a collection of small electronic circuits.
• Electronic Circuit Diagrams - Schematics with descriptions and do-it-yourself electronic projects for hobbyists.
• Electronic Circuit Projects - A circuit archive with schematics, descriptions and PCB layouts.
• Electronic Circuit Projects - Electronics projects, schematics,PCB tips for high school students, teachers, students, and hobbyists.
• Electronic Circuit Schematics - Free collection of electronic circuits diagrams, schematics and hobby projects. Includes amplifiers, battery chargers, power supplies and other.
• Electronic Circuits - An archive of electronic circuits divided into categories such as power supplies, auto, computer circuits, sound/radio.
• Electronic Circuits - Electronic circuit diagrams, software, tutorial, schematics, projects, and tools.
• Electronic Circuits Directory - A collection of electronic schematics and projects, index of tutorials and design software.
• Electronic Circuits and Microcontroller Projects - A collection of electronics circuits, microcontroller projects, and tutorials for hobbyists.
• Electronic Circuits for Beginners - Site with simple circuits that are easy for beginners in electronics to build and understand
• Electronic Circuits for the Hobbyist - Electronics projects, schematics, and tutorials: high voltage, radio control, timers, oscillators, RF transmitters, amplifiers and other.
• Electronic Diy Schematics - Electronic schematics: audio amplifiers, radio transmitters, power supplies, oscillators and antennas.
• Electronic Info and Schematic Page - Technical references and schematics archive: alarm, audio, auto, etc.
• Electronics Circuit Forum - Electronic circuits and projects with description, diagrams and PCB, electronics articles.
• Electronics Circuit Search Engine - A search engine for electronics circuits.
• Electronics Guides and Projects - Contains electronics projects and guides, including microcontroller programming.
• Electronics Hobbyist - Projects for beginners, articles on electronics and electrical science, Tesla coils, electrostatic devices, and resource links for the hobbyist and educator.
• Electronics Infoline - Search engine and categorically organized circuits in a directory.
• Electronics Lab - Electronic circuits with full description, diagrams and PCB, electronics articles, links and downloads.
• Electronics Projects with Circuit Diagrams - A collection of electronics projects and circuit diagrams. How to build your own electronic gadgets.
• Electronics Zone - Electronic circuits, kits, do-it-yourself, circuit diagrams, design and electronics hobby schematics from alarms to test circuits.
• Electronics and Electrical Engineering Resource - Electronics theory, books, construction projects, tips, and practical advice.
• Electroniq.net - Electronic schematics, circuits, projects, tutorials and software for hobbyists.
• FC's Electronic Circuits - Circuits on solar power, micro power FM broadcasting, a temperature controlled NICD charger, and more from Forrest Cook; electronics links.
• Flylab by SQ2OMC - Various electronic projects to make at home and the homemade shortwave transceiver.
• Free Circuit Diagram - Electronic circuit schematic diagrams collection.
• Free Electronics Schematics Diagrams - Electronics diagrams: pro music equipment, vintage tube amplifiers and other; chat room.
• GE Power Management - The art and science of protective relaying. A complete online textbook.
• Hobby Circuits - A large collection of simple electronic circuits for hobbyists from Imagineering On-line Magazine.
• Hobby Electronics - From Japan. Several interesting circuits. Some interesting theory and applications.
• Home Brew Spectrum Analyzer - How to make a spectrum analyzer with tips and advice on component selection and architecture. A large number of circuit ideas and schematics, with sources and construction tips.
• Hotwater Electronics Projects - Electronic projects covering GPIB connectivity, instrumentation, microcontrollers, Ham radio and wireless communications with PCBs and key components.
• Julien Thomas Enterprises - RS-232 protection and connections schemes. For protecting your Mother Board.
• Learn Electronics - Schematics with descriptions and do-it-yourself electronic projects for hobbyists.
• Music Electronics µArchive - An archive of tube and transistor amplifiers and information, mostly for music applications.
• PIC Based Analog Synth - Project to build a real analog synthesizer using easy to get components.
• Powerlab-TR - Projects related to electronic engineering. Includes schematics, source codes of embedded systems, microcontroller based electrical motor driver or finite element analysis with free and open source tools.
• Ronald´s Electronic Project Site - Fully documented electronic projects, such as stand alone microcontroller circuits and nixie, numitron and decatron clocks.
• Rugby PIC Clock - Schematic a construction of a 60kHz time code receiver and clock. Includes PIC programmer and LED clock display.
• Sam Electronic Circuits - Electronic Circuits for the hobbyist, analog, audio and digital, useful circuits with full Greek descriptions , diagrams in Greek and English.
• Sam's Schematic Collection - Includes information about safety, power supplies, Jacobs Ladders, circuits, IR detectors, power oscillators, and schematics.
• Small TV Terminal - TV terminal design. Connects TV and PC keyboard to a microcontroller based device.
• StarGate-TR - Projects related to Electronics Engineering. Includes schematics, source codes of embedded systems, such as microcontroller based electrical motor driver or finite element analysis with free tools.
• Synthesizer Home Page - How to make a very nice and stable frequency synthesizer from Harvard. Includes schematics, block diagrams and parts lists. Very through design.
• Tech Tut - A blog on electronics projects, ideas, and tips on repairing broken electronics.
• Techlib.com Electronics - Audio, PC, games, phone, oscillator, power, test equipment, and weather related schematics and information.
• Television Schematics - Television schematics for electronic specialists who repair TV sets.
• The Electronic Peasant - Dedicated to inexpensive Do-It-Yourself music electronics, electronic salvage/recycling, and alternative energy projects.
• Tomi Engdahl's Electronics Pages - Electronic circuits and projects designed by Tomi Engdahl. Audio, video, computer, data communication, light effects and controllers, power supplies, and telephone circuits.
• Tromop Info - Information on B-7971 smartsockets, nixie tubes, nixie tube clocks, and other electronics.
• WeMan's Electro Stuff - Audio tubes, transistors, analog circuits, transistor amplifiers as well as connector pinouts.
• Wenzel Associates Technical Library - Time, oscillation and frequency circuits, articles, and tutorials.
• WhatCircuits.com - Electronic circuits and electronic projects: audio, automotive, power and other.
• Your Electronics Open Source - Electronic projects, firmware, circuit board, reference designs, datasheet, application notes.

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