Supliment: 50 scheme electronice si montaje practice
Un instrument deosebit de util care echipeaza amplificatoarele Hi-Fi este cunoscut sub denumirea de VU-metru. Cu ajutorul acestuia pot fi sesizate pragurile de intrare in saturatie, egalizate puterile pe cele doua canale stereo, masurate nivelurile semnalului, etc.
Montajul (figura 1) permite adaptarea la orice amplificator audio. Pragul de nivel maxim se prestabileste prin intermediul potensiometrului P1. Tranzistorul T are rolul de amplificare a semnalului, daca sursa de semnal este insuficienta pana la nivelul maxim. Din colectorul acestuia, semnalul audio se aplica unei putin redresoare. Filtrarea se realizeaza prin intermediul capacitatii C4. Instrumentul poate fi unul obisnuit, utilizat curent la magnetofoane.In figura 2 se poate urmari un exemplu de realizare a scalei VU-metrului, daca se utilizeaza un microampermetru logarithmic.
Montajul poate fi alimentat de la o sursa ce poate furniza o tensiune stabilizata cuprinsa in domeniul 12 … 24V.
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In figura 2 se poate urmari un exemplu de realizare a scalei VU-metrului, daca se utilizeaza un microampermetru logarithmic.
