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24 Line Parallel Interface for the PC - big file in pdf format, you might only need the schematic  4QD's pages of interesting circuits 8254 timer/counter board - The schematic, theory of operation, construction tips and parts lists  Aaron's Electronic Circuits A Home Built (almost) Panasonic/MKE/CR56x CD-ROM Interface  Ampage (Tube amps, music electronics schematics) Ampeg Schematics (Music Electronics) Ampex Audio Schematics Analog-to-Digital and Digital-to-Analog Conversion via the IBM-PC Parallel Printer Port  Andreas's projects Aren's Attic Tube Amplifiers Atari Schematic's Central Audio Crafter's Guild (articles and essays on audio circuits) Audio Electronics Design Audio Electronics Page Audio, TV, VCR schematics etc. Barracuda-Central.org - site about parallel port interfacing, and other PC projects Beyond Logic - free on-line tutorials on connecting anything electronic to your PC using common interfaces such as the Serial and Parallel Ports  Bob's Music/Vacuum Tube Audio/Electronics page Bowden's Hobby Circuits Cable diagram database (large collection of pin-to-pin cable connections) Cahner's s-inSITE - The Electronics Industry Knowlege Network Car Audio Schematics Circuit Central (large collection of circuits) Circuit Exchange International Circui to Z.net Circuit Sage , tutorials, information, design articles and circuits on A/Ds, PLLs, LN/PAs, filters, opamps and transceivers Cool Schematics, audio amplifiers Computer Demolition - demystifies Technology by having kids disassemble and explore older Personal Computers  CyberCircuit , Circuit Archive Delabs Circuits, circuit and link collection Digital Music Zone circuit collection Discover Circuits , a  collection of 6000+ electronic circuits or schematics EE Circuits Archive Schematics Components Models Microprocessors Text files Software libraries Newsgroups and other links; Electronic Circuit Reference Electronic Cookbook Archive , (University of Alberta), ftp archive site whose primary purpose is to serve as a repository for schematic diagrams and circuit information; some electrical engineering related software is available there as well. Electronic Circuits Design -all kinds of material for for design of electronics circuits Electronic Circuits for the hobbyist , Circuits, Sotware, Links etc. ElectronicFr , microcontrollers, robotics, domotics and embedde computing Electronics 2000 Electronics Hobbyist   Electronics Zone (Electronic circuits, do-it-yourself circuit diagrams, kits and electronics hobby schematics) Emil Vladkov's Resources (some schematics and 8051 stuff) ePanorama.net (large collection of useful web pages on electronics) ESP Audio Projects FC's Electronics Circuits Free Circuits. as the name says... GEO, The Guitar Effects Oriented Web Page Guitar amplifiers Guitar Effects Schematics Hardware Book ( free collection of connector pinouts, cable descriptions and circuits) Headwize Projects, headphone amplifiers HiFi-magazine's tube amplifiers (in finish) ICHE Schematics Jerry's gadgets, gizmos, crafts, and curious things Jordan's RF Web Site Kiarchive PC Hardware documentation ,hdd, modem, PCI, soundcard, video  l earnc.com , real-world equipment controlling using PC and C from basics  Leper's Vintage Schematics (Music circuits) Library of practical electronics Linear Electronics Troubleshooter Magnatone , the unofficial amp site Music Amp Schematics Music Electronics uArchive Music Instrument's schematics Music Machines: Schematics Parallel port ADC/DAC - 8-bit, 110kHz ADC and DAC  Pat's Tube Schematics PCKits Tutorials , power sources, parallel port, joystick port, serial port, ISA bus  Pier's homepage , uP programming projects Plans for a 4-channel 8-bit analog-to-digital converter for PC   Prefect's Pages, audio projects Pro Audio Equipment Schematic Page Quad ESL Pages & Other Audio Projects RadioLocman Circuits Radio Schematics Red Circuit Designs Sam Electronic Circuits Sam's Schematic Collection Shaltungsdienst Lange, service and instruction manuals of all electronics manufacturers SDS Labs Schematics (audio circuits, tube amplifiers) SynthFool (synthesizer schematics) Technik.net (hardware info, link list, schematics, etc.) Temperature meter which can be connected to PC, text in Finnish  The Class-A Amplifier Site The Design of Car Power Amplifier The Do-It-Yourself Audio Corner The Leach Superamp, high class audio power amplifier Tomaz's Schematics collection Tomi Engdahl's Electronic Circuits University of Washington Circuits Archive Vintage Quad Electronic diagrams Wenzel Associates Technical Library