Qucs is a GPL circuit simulator. And if you want the GUI option, you might want to try out QucsStudio, which uses Qucs under the hood, and is free to use, but binary-only.

The Solution Simulator enables web-based electrically and thermally coupled analysis of semiconductor chip (junction) temperature during operation, as well as pin temperatures. It also measures the ...

While hardcore body-hackers are starting to freak us out with embedded circuit boards under their skin, a new more realistic option is becoming available — temporary tech tattoos. They’… ...

The new Circuit Board skins are printed using Dbrand’s new “three-dimensional UV printer” that can print two-dimensional imagery but with certain elements having a slightly raised texture.

Adapted from The Circuit Designer's Companion, Third Ed., by Peter Wilson (Newnes). 1.1.8 Inter-board interface signals There is one class of signals we have not yet covered, and that is those signals ...