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modificare transformator

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am un transformator de 12V 10A(cu o sarma pe secundar de 3.5-4mm) si vreau sal modific (sal rebobinez) ca sam-mi fac un amplificator cu dansu.acu este ideea ca trebuie sa stiu cu ce sarma sal rebobinez pt a obtine 2x25V sau 2x30Vtraful cantareste vreo 5 kg si are o placa intre primar si secundar pentru a capta parazitii ea trebuind cuplata printr-un fir la masa carcasei.pls help mesi inca ceva. sincer nu stiu de unde as putea procura sarma de bobinaj si ma gandeam dak nu as putea lua din aceea folosita pentru electrica de 1 mm sau 2!

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