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Utilizare prefinali


Guest Danut98

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Guest Danut98

Va salut. Sunt incepator intr-ale electronicii, prin urmare intrebarea mea este una de novice.

Intr-un amplificator mai este necesara utilizarea prefinalilor, daca se folosesc finali complementari?

Excluderea prefinalilor duce la o scadere a puterii de iesire sau la o eventuala instabilitate?

 

Va multumesc. :)

Edited by Danut98
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Prin excelenta , etajul final al unui amplif cu siliciu este tip dublet sau triplet ( ma refer la una din ramuri cealalta fiind identica)...

 Tranzistorii prefinali in varianta dublet sau etajul prefinal in varianta triplet, sunt absolut necesari pt. ca etajul final la un amplif cu tranzistori amplifica in curent , la modul ideal amplificarea in curent este produsul lui hfe al tranzistorilor care compun etajul final ...acest mod de lucru permite adaptarea f. usoara a sarcinii la etajul final...

De asemenea, acest fapt permite comanda acestui etaj final cu tensiuni / curenti mici , reglajul unor valori prestabilite se face simplu si etajele de comanda lucreaza la curenti mici , asta inseamna stabilitate mare a parametrilor...

 Asa , foarte pe scurt, de fapt fenomenele sunt mult mai complexe...

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