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Guest Marian88

vumetru

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Am gsit o schema a unui vumtru si am realizat'o, dar nu functioneaza, as vrea sa stiu daca e nevoie de un amplificator de semnal sau de vreo alimentare care a fost omisa. .

Trebuie si sursa de alimentare si o sursa de semnal audio care se aplica la intrarea circuitului LM3915,unde este specificat Audio input .Tensiune de alimentare intre 9V si 12V cu minusul la masa (pinii 2-8-4 ai IC1 ; 8-13-15 ai IC2) iar plus 12V la pinii 3 si 9 IC1 ;16 al IC2. In functie de nivelul semnalului de la intrare , se vor aprinde ledurile de pe '' bara '' conectata prin R5 la pinul 1 al IC1,la semnale un pic mai mari cele conectate la pinul 8 prin R4 si apoi cele conectate la pinul 17.
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