Hello @alexpikkert and @JackANDJude,
I just made a protobit with in series with the 5V a Schottky diode BAT85, which drops the voltage by 0.40 Volts. Just enough for the circuit to operate without distortion. Across the output, I mounted a capacitor of 220uF to smooth the 4.60 V. Everything works fine now.
The circuit ( with volume turned fully up ) consumes about 40mA which is safe for the BAT85.
This diode can forward a current of 200mA.
The center output connection is also feeded by this 4.60V ( white wire in the picture ).
Of course, when more modules are added, a better regulator is needed.
How can you add a picture ? I don’t see the the symbol in the edit tab ??