Except as noted I make no endorsement as to the reliability of the businesses or accuracy of the information given on these sites.
I'm a freelance contractor who ended up doing a mixture of audio, industrial and microprocessor projects. Some of the reverse engineering and creative solutions are interesting.
PartSim - Online Circuit Simulator with SPICE | PartSim
Electronic Circuits Design of electronics projects and hobby kits
Circuit Diagram - Schematics is the language of electronics. It provides a concise and comprehensive diagrammatic description of a circuit. Schematics.com allows users to connect and share designs and ideas in a like-minded community.
Datasheets 360This site has 70 million electronic components, each with its PDF datasheet. We're working on scaling the site up to 350 million parts (We should be up to about 180 million this summer).
The site has inventory and pricing from many of the top distributors. It also features a part number search that is very good.
Test Equipment and Tools.Circuit Specialists carries a number of assorted test equipment devices and tools that make home do-it-yourself projects quick and easy.
I have been dealing with Circuit Specialists for many years and can vouch for their reliability and integrity. Max Robinson.
Electronics projects, and circuit diagrams.
KeyDemon
Hardware Keylogger.
Fully assembled, kits, or total DIY.
Datasheet Archive. Search engine for electronic component datasheets and application notes.
This page last updated July 23, 2012.