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filtrru activ alimentat la 12 volti help

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am gasit scchema aceasta de filtru http://ccc.domaindlx.com/Nastase/2/Filt ... _285Hz.jpg pe net si nu inteleg cateva lucruri

1) cine este U1a si U1b.Acolo zici cam e un singur integrat tl082 sau sunt 2 ?

2)al doilea tl082 daca exista cum se alimenteaza +12 si gnd ?

3)io vreau sa folosesc filtru pe un tda 1562q alimentat la 17,5 volti si ma gandesc ca daca alimentez filtru asta cu 17.5 v nu il prajesc ?

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