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Nelamurire amplificator TDA7375V

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Buna!Am facut un amplificator cu TDA7375 ,totul a fost ok dar cand il leg la pc se aude orice scroll ,fasait,de la alta sursa de semnal merge ok.Kitul de la adelaida cu TDA8560Q nu are nici pic de zgomot nici la pc,l-am studiat si am vazut ca pinul 2 nu este legat direct la masa ,este legat la masa printr-o rezistenta de 200ohm .Am copiat idea sa vad daca merge si la TDA7375 sa separ masa de la intrare de masa de iesire cu rezistenta de 200ohm.deci la TDA7375 datasheet : C8=47uf (pin 6) legat la masa prin 200ohm ,pinul 9 legat la masa prin 200ohm,la fel si masa de la intrare semnal tot prin 200ohm. Zgomotul nu a disparut plus ca s-a si incalzit integratu care de obicei e rece ca gheata.Singura modificare cu care merge: pinul 9 trebuie legat direct la masa ,in rest a ramas cum am descris mai sus.Am inteles ca la TDA8560Q s-a facut separare masa de intrare fata de cel de iesire cu R=200ohm,dar la TDA7375 pinul 9 este pinul (Signal ground) normal ar trebui separat de masa (Power ground) nu?

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