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Buna ziua, am construit pe un cablaj de test sursa din schema atasata, dar in momentul in care ii fac scurt pe iesire, se arde LM317. Nu ar trebui ca LM317 sa intre in protectie ? Unde gresesc ?

Am folosit: BC556 in locul lui 2N2905, in locul rezistentelor de 5k am pus 4.7k, potentiometrul este de 1k.

In momentul in care se arde LM317, tensiunea de pe intrare devine egala cu cea de pe iesire (33Vcc).

Am folosit o punte redresore de 10A si un condensator de 4700uF/63V pentru filtrare...

FRBW1ACIIKMGJ6F.LARGE.jpg

Edited by Mihai3

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In afara faptului ca e o prostie ce vrei sa faci cu trei LM317, nici macar nu ai citit fisa tehnica a circuitului.  Gasesti acolo tot ce tine de protectie.

Lipsesc cateva componente la schema pusa de tine, componente pe care le-ai folosit in alte montaje cu LM317. 

Asta cu circuitele puse in paralel o faci in varful muntelui cand nu ai tranzistori ci doar LM-uri si trebuie sa mearga.

Edited by Ovidiu
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