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d2134

Factorul de amortizare (damping factor) la amp cu tuburi

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Cum se calculeaza teoretic nu stiu , eventual se poate simula in Spice daca ar fi modelele lampilor , dar nu cred ca rezultatul ar corespunde realitatii , sunt multi factori de luat in calcul . Insa impedanta de iesire se poate masura usor. Exact ca o baterie , numai ca in c.a. , amplificatorul e o sursa de tensiune , daca ar avea impedanta 0 de iesire tensiunea nu ar varia functie de curentul debitat. Deci dai amplificatorului la intrare semnal sinusoidal cu frecventa dorita ( impedanta de iesire si deci damping factorul depind de frecventa ) pentru a obtine aproape puterea maxima si modifici rezistenta de sarcina , sa zicem de la 4 la 5 ohmi . Masori tensiunea si curentul pe ( prin ) sarcina in cele doua situatii si raportul variatiilor este impedanta de iesire a amplificatorului :yawinkle:

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