A weblog focused on interesting circuits, ideas, schematics and other information about microelectronics and microcontrollers.
Online circuit simulator
Very good thing for the beginners, maybe funny for professionals -
Go and try thisat Falstad.com. When the applet starts up you will see a simple LRC circuit. The green color indicates positive voltage. The gray color indicates ground. A red color indicates negative voltage. The moving yellow dots indicate current.
To turn a switch on or off, just click on it. If you move the mouse over any component of the circuit, you will see a short description of that component and its current state in the lower right corner of the window. To modify a component, move the mouse over it, click the right mouse button and select "Edit".
And - have fun!
PS: The "Circuits" menu contains a lot of sample circuits for you to try.