The supply voltage has no bearing on the output voltage swing (gain). It is
determined by the feedback on the op-amp. Changing the feedback resistor(s),
if there is any type of equalization within the feedback will change the
equalization characteristics....but it goes a lot deeper than one can explain
on this list. You should study the theory of op-amps before proceeding with
redesigning the circuit. Try these sites as an example......
http://www.williamson-labs.com/480_opam.htm
http://www.uoguelph.ca/~antoon/gadgets/741/741.html
Rick

Tal Bejerano - AMC wrote:

> Hi 2 All
>
> I am building a phono to aux preamp based on LM4458. the output is too low
> if compared to real phono input.
> my question is:
>
> Are the voltage supply to the OPamp effect the output? now I use +-9v
> supply.
> I cant test it now, cause I built fixed PSU.
>
> Regards
>
> Tal Bejerano
> AMC - ISRAEL
>
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