Circuit designs that can be incorporated into projects.

• RIAA Compensated Stereo Preamp - A turntable preamp board and circuit design. useful if you want to make a Traktor mixer/Controller with an optional turntable input.

• discovercircuits.com - discover circuits, has 25,000+ electronic circuits or schematics cross-referenced into 500+ categories. As a vital resource for engineers, hobbyists, inventors & consultants, the site's collection of information will help you find quick solutions to electronic design problems.

• Electronics Lab - find useful circuits with full description, diagrams and PCB, electronics articles, links and downloads. very cool site for electronics

• ElectronicsInfoline.com - Circuit book, lots of different circuits. Slowly being migrated to this blog

• Mondo Technology - More circuits