Mishu_17 Posted July 14, 2009 Share Posted July 14, 2009 Am realizat sursa din schema de mai jos , am adaugat o punte redresoare , un condensator de filtrare inainte de sursa . Am legat la un transformator care are 14 Volti CA in secundar , iar dupa redresare cam 17 Volti . Problema e ca nu functioneaza , tensiunea nu poate fi marita sau micsorata . Va rog sa ma ajutati . Quote Link to comment Share on other sites More sharing options...
miron1947 Posted July 14, 2009 Share Posted July 14, 2009 Unde este notat cu X1-1 X1-2 X1-3,ce element regulator ati pus?[attachment=0]723.JPG[/attachment] Quote Link to comment Share on other sites More sharing options...
Mishu_17 Posted July 14, 2009 Author Share Posted July 14, 2009 E tranzistorul de putere . X1-1 - baza , X1-2 - colectorul , X1-3 - emitorul Quote Link to comment Share on other sites More sharing options...
miron1947 Posted July 14, 2009 Share Posted July 14, 2009 E tranzistorul de putereNPN sau PNP?Ce tensiune aveti pe iesire? Quote Link to comment Share on other sites More sharing options...
Mishu_17 Posted July 14, 2009 Author Share Posted July 14, 2009 E tranzistor NPN , la iesire am tensiunea de aproximativ 12 - 14 Volti , dar nu se poate regla de la potentiometru . Schema e din datasheet - ul lui LM723 . Quote Link to comment Share on other sites More sharing options...
miron1947 Posted July 14, 2009 Share Posted July 14, 2009 Aveti cca. 7V pe In+(5)?Daca da,cat aveti pe In-(4),variaza cand rotiti potentiometrul,daca da,care este tensiunea maxima obtinuta aici? Quote Link to comment Share on other sites More sharing options...
Mishu_17 Posted July 14, 2009 Author Share Posted July 14, 2009 Circuitul integrat e nou , pe pinul 5 am 7,09 Volti . Pe pinul 4 nu variaza . Quote Link to comment Share on other sites More sharing options...
miron1947 Posted July 14, 2009 Share Posted July 14, 2009 Pe pinul 4 nu variaza .Atunci acolo este problema,In - si In +,formeaza un comparator.Verificati daca rezistentele si potentiometrul sunt bune.Prin divizorul format din R3,R4 si pot R5,apare reactia necesara ajustarii tensiunii de iesire. Quote Link to comment Share on other sites More sharing options...
Mishu_17 Posted July 14, 2009 Author Share Posted July 14, 2009 Pe rezistenta de 3 KOHMI imi arata 2,74 , iar pe cea de 3,3 KOHM 3,27 , potentiometrul e bun , am verificat intre unul dintre pini de pe margini , cu cursorul , iar rezistenta variaza intre 0 - 1 , 03 K . Quote Link to comment Share on other sites More sharing options...
miron1947 Posted July 14, 2009 Share Posted July 14, 2009 Pe R 3,cat aveti pe capete?Daca o suntati,regleaza tensiunea de iesire? Quote Link to comment Share on other sites More sharing options...
Mishu_17 Posted July 14, 2009 Author Share Posted July 14, 2009 Am 6 , 88 volti . Quote Link to comment Share on other sites More sharing options...
miron1947 Posted July 14, 2009 Share Posted July 14, 2009 Am 6 , 88 volti .Este normala caderea de tensiune la 3,27V,suntati-o. Quote Link to comment Share on other sites More sharing options...
Mishu_17 Posted July 14, 2009 Author Share Posted July 14, 2009 Cum sa o suntez ? De fat ce insemna a sunta ? Quote Link to comment Share on other sites More sharing options...
Mishu_17 Posted July 14, 2009 Author Share Posted July 14, 2009 E corect legat asa la pinii integratului ? Quote Link to comment Share on other sites More sharing options...
miron1947 Posted July 14, 2009 Share Posted July 14, 2009 Cum sa o suntez ? De fat ce insemna a sunta ?A sunta,vine din germana = a pacali,vedeti cum arata desenul. Quote Link to comment Share on other sites More sharing options...
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