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30V din baterii de 9v

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salutam nevoie de 30v scosi din baterii de 9v. in varianta de scadere voltaj din 4x9V as fi folosit lm317 sa scoata direct 30 dar nu suporta mai mult de 36v (cind sunt noi bat vad ca scot ~9.7v), iar modelul de lm317 care suporta 56v nu se gaseste pe la magazine.ar fi corect sa pun un set lm317 la 2x9v sa scoata 15v in serie cu alt set identic?sau imi sugereaza cineva o metoda simpla? curentul final va fi mic, intre 1-10mA, asa ca as prefera ca circuitul de limitare 30v sa nu consume si el cine stie cit.multumesc mult.

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