Yenka Electronics lets you design and simulate circuits using over 150 types of component, testing and refining your design as you work.

Developed around the acclaimed electronics simulation used in Crocodile Clips, the components on offer range from simple power supplies and switches, through sensors and semiconductors, to extensive sets of 4000 and 7400 series ICs. Many offer several real models - for example, 10 types of NPN transistor are on offer.
Based on a brand new version of the Crocodile Clips simulation engine, Yenka Electronics has been refined to make electronic design more straightforward - even for less experienced users.
For example, drag a component onto a wire, and it will be automatically inserted; no need to delete old wires or draw new ones. Drop it on an existing component, and it'll replace that component.
The interface refinements make whiteboard work easier, too. The toolbar, parts library and editing panels can all be moved, or even hidden away completely - to let you use the full screen. Customised topics refine the component libraries, so that you only see the parts you need.