HEATKEYS

Free source of SPICE circuit files and tutorials for the hands-on learning of electronics through the SPICE simulator. Also inlcudes SPICE basics and a command summary. Links to free demo versions.

Toroids, Ferrites, Parts, Kits, Toroid King, QRP Erector Set

Electronic Engineering Times is the industry resource for news, analysis, design ideas & solutions, products, education, & engaging with the EE community.

Head-Fi.org: Head-Fi covers headphones, portable audio, earphones, earbuds, headphone amplifiers and audiophile equipment.

GPS Tracking Systems

QRP, Homebrew amateur radio receivers, transmitters & transceivers. QRP related

Technicalaudio.com has useful information relating to various technical aspects encountered in music and sound recording and production. There are links to some companies and people who often work together building and maintaining various gear and i...

ESP - The Audio Pages. Professional results for the DIY enthusiast. Audio articles, projects to build and general information about hi-fi amplifiers, loudspeakers and audio in general.

Electronic circuits projects and diagrams

NXP is a leading semiconductor company founded by Philips more than 50 years ago. NXP creates semiconductors, system solutions and software that deliver better sensory experiences in TVs, set-top boxes, identification applications, mobile phones, car...

Avedis Audio Electronics designs & manufactures pro audio equipment, professional audio, studio recording, microphone preamps, mic preamp, 500 series, rack mount, equalizers & discrete operational amplifier 1122 & op amp.

Design resource, news, articles, focused on Analog EDA, Audio and Video, Optical/Wireless/RF, Power Management, Sensing/Conditioning/Conversion.

This multimedia site contains tutorials, free software for circuit designs including PLL, filters, directional couplers, and electronic circuit schematics.