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Generator de ton cu timp setat

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Salutare. Am nevoie de-un circuit care sa faca un oscilator pentru un speaker de 8ohmi, sa functioneze doar 10 secunde dupa ce a fost alimentat. Atentie, nu va fi un semnal scurt care sa faca circuitul sa functioneze ci unul lung (ca altfel putea folosi 555 timer in regim monostabil). Asta e dilema mea. Cum fac ca un circuit sa functioneze un timp scurt chiar daca el primeste in continuu tensiune?

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