Resources

• Acoustic Treatment and Design for Recording Studios and Listening Rooms by Ethan Winer
• AudioXpress magazine (formerly "Audio Electronics", "Glass Audio", "Audio Amateur" and "Speaker Builder")
• Considerations for a High Performance Capacitor by Richard Marsh
• Counterfeit transistors Elliot Sound Products' comments about counterfeit transistors
• DIY A/V RCA Compression Connector Cables Morsel's guide to making audiophile interconnects
• DMMs (digital multimeters) A useful synopsis
• Datasheet Archive look up electronic parts datasheets
• Discover Circuits audio circuits for hobbyists
• Eminent Technology's Multimedia Loudspeaker Test sound files of test signals
• JFET biasing tutorial by Wes Hayward
• Krishu.de DIY turntable gallery and other hifi stuff
• LDSG Loudspeaker Driver Selection Guide
• Lynn Olson's "The Art of Speaker Design" discussions about speaker design
• Mil-spec resistors
• MOSFET Testing by Richard Torrens
• Measurements of speaker driver parameters
• Multi-stage differential amplifiers a technical paper
• Nelson Pass (Pass Labs) DIY site
• Picking Capacitors (Part I) and (Part II) by Walt Jung and Richard Marsh
• Per-Anders Sjöström's hifi pages projects, kits, downloads, links, blog, forum, etc.
• RaneNote 110 sound system interconnection
• RaneNote 151 grounding and shielding audio devices
• RightMark Audio Analyzer (RMAA) computer software for testing audio devices
• Sam Electronic Circuits free electronic circuits for the hobbyist
• Standard resistor values defined by the EIA for different tolerance families
• Tangent's Audiologica lots of good info for DIY headphone amplifier fans
• The Amplifier Institute, Douglas Self's audio amplifier engineering analyses and discussions
• "The Art of Electronics" by Horowitz & Hill a superb textbook about electronics
• The Sound of Capacitors by Steve Bench
• W. Marshall Leach's web site with links to his works
• Walt Jung's web site with links to his works
• Tektronix XYZs of Oscilloscopes
• Zener diode reference A handy table of common zener diodes

Web Forums

• AndAudio.com for headphone and DIY enthusiasts in Taiwan and elsewhere (traditional Chinese)
• Audiohall for DIY audio enthusiasts in Taiwan and elsewhere (traditional Chinese)
• Audio Asylum Audio-related forums
• AudioCircle.com Audio-related forums
• diyAudio.com DIY Projects for the fanatics
• diyforums.org for the revised Millett Hybrid headphone amplifier and other DIY audio topics
• erji.net Forums for headphone enthusiasts in China (simplified Chinese)
• Headwize.com for headphone enthusiasts
• Head-case.org for headphone enthusiasts
• Head-Fi.org for headphone enthusiasts
• headphoneamp.co.kr for headphone and amplifier DIY enthusiasts in Korea (Korean)
• ipastudio.com for iPod® enthusiasts with sub-forums on DIY audio
• ourfootprints subform on computer/audio/video for overseas Chinese (traditional Chinese and English)
• sgheadphones.net for headphone and amplifier DIY enthusiasts in Singapore

Online Calculators

• Capacitor value unit conversion
• dB to voltage gain calculator
• Voltage gain to dB calculator
• A collection of calculators for electronics
• LED current-limiting resistor value calculator
• LM317 voltage regulator resistor values calculator
• Op-amp noise calculator
• Phono cartridge loading resistance and capacitance
• Resistor color bands
• Various speaker design related calculators
• Stepped attenuator resistor values
• Wire inductance calculator
• Wire resistance calculator

Vendors

• Allied Electronics electronic parts and equipment
• Angela Instruments audio electronics specialty parts
• Avel-Lindberg toroidal transformers and power converters
• Borbely Audio Erno Borbely's audio kits and components
• B&D Enterprises many hard-to-find Japanese semiconductors
• CadSoft Eagle Lite Freeware version of the Eagle schematic/pcb CAD software
• Cimarron Technology Browndog IC adapters
• Circuit Specialists and Web-tronics.com electronic parts and equipment
• Conrad Heatsinks heatsinks
• diyclub.biz audio kits and parts vendor in Hong Kong
• Digi-key electronic parts and equipment
• Elliot Sound Products Audio kits and resources
• ERSE Audio DIY speaker and audio parts
• Express PCB printed circuit board fabrication and CAD software
• Farnell electronic parts and equipment
• Front Panel Express custom enclosure front panels and CAD software
• Hammond Manufacturing racks, enclosures, transformers, outlet strips
• Handmade "boutique-grade" and other audio parts
• Imagineering (PCBnet) printed circuit board fabrication
• Lansing Enclosures enclosure/chassis vendor
• MCM Electronics audio/video/electronic components, speaker drivers and parts
• Madisound Speaker Components speaker drivers, parts and other speaker-building materials
• Mouser electronic parts and equipment
• Newark Electronics electronic parts and equipment
• Par Metal enclosure/chassis vendor
• Parts Connexion audio parts and accessories
• Parts Express audio/video components, pro-sound, speaker drivers and parts
• Percy Audio "boutique-grade" audio parts
• Plitron toroidal transformers
• RS Components electronic parts and equipment
• Realaudio audio parts vebdor in Taiwan
• Speaker City speaker drivers and parts
• SumR (Richard Sumner Technology) toroidal transformers
• THL Audio audio parts vendor in Taiwan
• Welborne Labs audio kits and parts
• Zalytron speaker drivers and parts