John La Rooy wrote:
> There are different symbols for the different types of ground.
> The one with the three horizontal lines is earth
>
> http://en.wikipedia.org/wiki/Ground_(electricity)#Electronics
>   
That may be some standard for which to use when, but the reality is that
the majority of circuit diagrams I see use the "earch ground" symbol
regardless of whether thier ground rail is actually connected to earth.



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