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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
    • 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;
    • Electrical 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 for the hobbyist , Circuits, Sotware, Links etc.
    • 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
    • GEO, The Guitar Effects Oriented Web Page
    • Guitar amplifiers
    • Guitar Effects Schematics
    • Hardware Book ( free collection of connector pinouts, cable descriptions and circuits)http://geocities.yahoo.com/
    • 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
    • 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