We are committed to build the largest database of circuit diagrams, and free for electronics engineers.
Schematics.com is a free online schematic editor that allows you to create and share circuit diagrams.
RadioManual.eu - Schemi elettrici e manuali per radioamatori. RadioManual.eu - Diagram and manuals.
Free electronics DIY projects with circuit diagram and description with each project. All projects are divided into different categories.