[sdiy] converting circuits to work with lower voltages

[Milo Barrowclough]

hi everyone
 
there are several cicruits that i would like to build, but they all require + - 15 volts.
is there anyway to modify the circuit so that it will work on lower voltages such as +9 -9 volts e.g. two 9-volt batteries?  maybe i could reduce each resistor value by a ratio or something.
 
thanks

		
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