wzab ha scritto:
> Hi,
> 
> I need to add simple amplifier to my digital system which is powered 
> from a single 5V battery.
>[...]
> However antoher idea is to use something cheap and standard like MAX232.
> Has anybody tried to use this chip just as a voltage converter?

I used it recently to power a LCD graphic module which needed some 
-5..10V to operate.

I expect the current to be in the range of the 5..10mA - indeed one can 
try it easily.
I also expect it to be a bit noisy for an OpAmp - but no worse than a 
DC-DC like the one you suggest.

Dario
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