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3-30 V/2.5 A Stabilized power supply


homer
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Buna ziua.

Am incercat sa fac sursa din acest link http://www.electronics-lab.com/projects ... index.html dar intampin niste probleme.

 

Am schimbat puntea redresoare cu una mai mare putin decat cea mentionata in schema folosind una de 8A-1000V. Deasemenea, am luat si un condensator de capacitate mai mare 4700uF in loc de cel de 2200uF tinand cont ca trebuie prevazut cam 1000-1500uF/A.

Traful pe care il folosesc este de la 220V la 24V de 63VA deci cam 2.6A.

Am montat toate componentele pe placa de circuit dar nu functioneaza circuitul.

Din puntea redresoare fara sa fie conectata la circuit am masurat aprox 26V DC la intrare avand aproximativ 29-30V AC.

Dupa ce conectez puntea la circuit tensiunea pe acesta devine aproximativ 39-40V, iar la iesire am masurat aproximativ 36V.

Daca rotesc de potentiometru nu se intampla absolut nimic, imi ramane aceeasi tensiune de 36V la iesire.

La un moment dat am incercat sa intorc tranzistorii crezand ca nu i-am pus bine, dar 2N3055 a inceput sa se incalzeasca excesiv de tare, in schimb puteam folosi potentiometru avand valori la iesire cam de la 3.5V la 30V adica cam cat e si normal.

 

Atasez si niste poze in speranta ca ii voi da de capat de unde provine problema.

 

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