Supliment: 50 scheme electronice si montaje practice
In multe cazuri este necesara o amplificare de banda larga in domeniul 0.l-MHz,lucru dificil de oblinut cu componente uzuale si traditionale pentru domeniul audio. Totusi, cu un amplificator operalional tip 741 se poate realiza acest deziderat daca sunt luate unele masuri de compensare la frecventele inalte.Figura 1 ilustreaza, prin intermediul graficului castig functie de frecventa, situatia normala si cazul realizarii compensarii. Pentru a realiza scopul propus se utilizeaza o schema conform figurii 2 unde semnalul este amplificat suplimentar de doua tranzistoare complementare (Q1 si
Q2). Castigul este de 6 dB in banda 0.1 – 2MHz. Montajul poate fi utilizat cu succes in banda audio cat si in videofrecventa.
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