best free software for drawing circuit diagrams

Eagle. At least it was when I looked at them. I'll probably pay the price for the full version pretty soon; rules-based PCB design is nice to have, and the schematic capture and library editing work pretty darned well.
 
Eagle is very good to make PCBs, but if you are after schematics an old fashioned pencil and paper may be your best bet....provided they are for your use and not to impress other people.
 
our school uses ORCad 9.1

it good for making schematic diagrams
can also be use for simulation designs
and for PCb making.....
 
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