> Hi Carlos,
> Just another take on your problem:
> I am currently building a small external box containing a 9volt battery to
> replace the A176 in my portable setup.
> The costs for this are less than €25 euros.
> I can imagine some person that is a more seasoned electronics
> person than me
> also including a voltage inverter in this design.
>
> greetings,
>
> Ernst

It is not possible to built a voltage inverter with a 9V battery only. You
need a bipolar supply (at least two 9V batteries) to built a voltage
inverter as it has to generate negative voltages. That's not possible if you
have only a positive supply available.

Best wishes
Dieter Doepfer