this is my TDA1554Q schematic :
you don't have to include 4r7, you can directly connect signal Gnd and power Gnd.
the 220r will help to prevent parasitic oscillation, and also from the supply noise which may be injected from your power line.
An externally hosted image should be here but it was not working when we last tested it.
you don't have to include 4r7, you can directly connect signal Gnd and power Gnd.
the 220r will help to prevent parasitic oscillation, and also from the supply noise which may be injected from your power line.
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