Good Virtual Circuit Building Software

Hi, does anyone know of any good software, which I can use to build a complex circuit (i.e. with chips, resistors and transistors), that can also test the circuit as well.

Not sure if such software exists, but I thought it might be worth a try.

Thanks

Some free ones:
Try Google for
DesignSpark
LT Spice

Cheers

PatM said:

Some free ones:
Try Google for
DesignSpark
LT Spice

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