What is the single best method to provide a
central ground rail when using a single
supply?

  At the moment i simply use
a X1 opamp to make the third rail.


Also,

many of these op amps will not swing rail to rail.
So, is it acceptable to simply take the op amp in
question and tie it X1 permanently to the upper/lower rail
to create the reference voltage necessary to establish
the lower or upper limit for a ground requiring the full
swing ?


Like , must opamps be matched like resistors or other
components to achieve the proper results ?

I already use these methods yet do not know
if this is acceptable or if there are better ways
to do these ideas?

They are small signal remedies and can not
handle more than like 10 to 20 milliamps at most.

geoff
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