Pages tagged schematics:

Categories of electronic circuits
http://www.free-circuits.com/circuits

Welcome to our Website! We are here to show You how to make various interesting electronic devices on your own. Some of the devices are: Amplifiers, Power sources, Metal detectors, Alarms, Insect repellant, light, sound or touch sensitive devices, Whistle responder which produces sound when called by a whistle and our visitor's favorite Light and LED devices… We can’t name them all right here, so we suggest You browse through our collection of diagrams on your own
Build over 400 electronic devices by yourself. All circuits are grouped into several categories.
Plans for all manner of electronic devices!