ioannis Posted March 3, 2007 Share Posted March 3, 2007 va salut!! caut schema de preamplificator audio hi-fi (intrare line) cu NE5532 fara corector de ton (numa preamplif) si s-a primeste un semnal de intrare de 1-2V si sa da la iesire cam 3-4Volti. am cautat dar nu m-am descurcat sa gasesc o schema!! astept ajutorul vostru!! Link to comment
nicky_l Posted March 3, 2007 Share Posted March 3, 2007 orienteaza-te din acest mixer, practic sunt 2 preamplificatoare Link to comment
ioannis Posted March 6, 2007 Author Share Posted March 6, 2007 va salut!! mai am inca o intrebare. de cite am inteles din schema amplificarea depinde de la valoarea rezistentei R2,R6 si este de 8 sau de 100 de ori asa cum este dat din schema. ca sa amplific de doua sau de trei ori semnalul de la intrare ce valoare trebuie sa are rezistenta? va rog corectati-ma daca gresesc!!!!! Link to comment
niq_ro Posted March 6, 2007 Share Posted March 6, 2007 Amplificarea oricarui operational este data de cele 2 rezistente, cea din bucla respectiv cea de la masa: A=1+Rr/Rm in cazul tau A=1+R3/R2, respectiv A=1+R7/R6 vezi http://homepages.internet.lu/absolute3/tronic/opsup.htm :yawinkle: http://www.uoguelph.ca/~antoon/gadgets/741/741.html si http://home.cogeco.ca/~rpaisley4/BasicOpAmp.html Link to comment
ioannis Posted March 7, 2007 Author Share Posted March 7, 2007 mersi mult pentru ajutor!!! Link to comment
ioannis Posted March 7, 2007 Author Share Posted March 7, 2007 am facut preamplif si merge perfect!!!! va multumesc foarte frumos inca o data!!! Link to comment
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