What battery would you like to use? 3 AAs in series would work, 4 if you use rechargeable Ni-cads. A single Li-ion battery (3.7V nominal) would probably work, but as it discharges your power amp might not be happy (data sheet says 3.6V minimum). A sealed lead-acid (SLA) at 4.5V would work. There are lots of options since your two devices overlap in the 3.6-5V range.I need help For wiring yhis two circuits with the same battery.
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by Jeff Child