sickdude Posted June 19, 2010 Share Posted June 19, 2010 Am prin casa un transformator care sta degeaba de 80VA- 31v si ma intrebam daca il pot folosi la ceva. Astept sugestii . (ceva mic ...2*xx w) http://picz.ro/pictures/0773c4cf4a946b29037aef230fa13a00.jpg Link to comment Share on other sites More sharing options...
remus68 Posted June 19, 2010 Share Posted June 19, 2010 Poti construi un amplificator stereo de 2 x 20W/8 ohmi cu TDA2050, 2052, varianta cu alimentare asimetrica si iesire prin condensator. Link to comment Share on other sites More sharing options...
sickdude Posted June 19, 2010 Author Share Posted June 19, 2010 Imi da cineva schema cu TDA2052 varianta asimetrica? Link to comment Share on other sites More sharing options...
remus68 Posted June 19, 2010 Share Posted June 19, 2010 Am impresia ca se poate utiliza numai TDA2050. La TDA2052 apar probleme din cauza conexiunilor la comanda mute/standby. Schema de utilizare a lui TDA2050 cu alimentare asimetrica o gasesti in datasheetul integratului. Link to comment Share on other sites More sharing options...
sickdude Posted June 19, 2010 Author Share Posted June 19, 2010 Ca filtraj ajung 2condensatori de 10000uf /35v sau trebuie voltaj mai mare? Link to comment Share on other sites More sharing options...
sickdude Posted June 19, 2010 Author Share Posted June 19, 2010 Puntea redresoare este buna asa pentru un transformator asimetric ? http://picz.ro/pictures/30977ea2e104f2fea3f6beadc2047e7b.jpg Link to comment Share on other sites More sharing options...
cristian_draghiescu Posted June 19, 2010 Share Posted June 19, 2010 31 V alternativ inseamna aproximativ 42 V pe condensatorul de filtrare. Deci trebuie sa folosesti condensator la 63 V. Poti inseria cei doi condensatori de 10000 μF pe care ii ai si obtii un echivalent de 5000 μF/70 V, dar atentie ! Sa aiba amandoi aceeasi capacitate, altfel tensiunile se distribuie inegal pe bornele lor ! Puntea redresoare este corect desenata. Link to comment Share on other sites More sharing options...
zal Posted June 19, 2010 Share Posted June 19, 2010 Ca să fie egal împărţită tensiunea pe cei 2 cond le pui în paralel cîte o rez de 3,3k/2W. Totuşi trafo e prea mic ptr un amplif decent. Link to comment Share on other sites More sharing options...
sickdude Posted June 20, 2010 Author Share Posted June 20, 2010 Daca scoate 2 x 20 e destul.Remus, la ce te-ai referit cand ai zis "cu iesire prin condensator"? Link to comment Share on other sites More sharing options...
Jimmy Posted June 20, 2010 Share Posted June 20, 2010 Adica pe iesire are inseriat un condensator de 1000-2200uF, care blocheaza componenta continua sa ajunga la difuzor. E necesar la amplificatoarele cu alimentare asimetrica, deoarece offset-ul e jumatate din tensiunea de alimentare. Link to comment Share on other sites More sharing options...
sickdude Posted June 20, 2010 Author Share Posted June 20, 2010 In schema are deja un condensator de 1000uf, sa mai pun unu? Link to comment Share on other sites More sharing options...
Jimmy Posted June 20, 2010 Share Posted June 20, 2010 Nu, nu e nevoie. Merge foarte bine cum e in schema. Link to comment Share on other sites More sharing options...
Th3_uN1Qu3 Posted June 21, 2010 Share Posted June 21, 2010 In schema are deja un condensator de 1000uf, sa mai pun unu?In functie de condul ala este determinata frecventa de -3dB la bas. Daca folosesti boxe de 4 ohmi eu as pune 2200u. http://www.muzique.com/schem/filter.htm Pe de alta parte, daca fortezi un amplif de putere mica sa redea mult bas nu mai ramane mare lucru pt restul deci e si chestie de preferinte. Link to comment Share on other sites More sharing options...
sickdude Posted June 21, 2010 Author Share Posted June 21, 2010 In datasheet scrie "C7 can be larger than 1000uF only if the supply voltage does not exceed 40V" iar eu o sa-i dau cam 43V(dupa redresare). Link to comment Share on other sites More sharing options...
remus68 Posted June 21, 2010 Share Posted June 21, 2010 frecventa de -3dB la bas Nu exista frecventa de -3db !!! Frecventa se masoara in Hertzi. Link to comment Share on other sites More sharing options...
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