FrancoItaly, nice to ear you!
Also try regulators and two 9 V batteries , but since my perspective doesn't work properly as 3 for positive and 3 for negative 1.5 V batteries.
What about internal resistence of batteries? I comprobe that many circuits works better with 6 X 1.5 V or 4 X 1.5 V common batteries than an only 9 V battery. Maybe?
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