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ELFORUM - Forumul electronistilor
Mishu_17

Alimentare circuite simple

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Am o problema . Cand alimentez un flasher cu NE 555 , de la o sursa cu LM 317 , circuitul integrat (NE 555) se incalzeste destul de tare . Cum poate fi rezolvata aceasta problema ?Am atasat schema sursei , impreuna cu cea a circuitului care il alimentez .

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Am verificat alimentatorul , care este bun , dar acel NE 555 tot se incalzeste . Apoi am incercat sa limitez curentul cu ajutorul unui LM 317 , la care am pus o rezistenta intre pinii 1 - 3 , dar problema e aceeasi , degeaba am incercat cu alte circuite realizate cu NE555 .

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rezisten?a R4 din primul pdf, de ce e 1 kiloohm???c? în datasheet se afirm? c? trebuie s? fie între 180 ?i 300 de ohmi... trebuie asigurat un curent de 5-10 mA între out ?i adjust, ?i exact de-aia se pune rezisten?a aia (r4=u/i, aka r4=1,25/10, ?i valoarea lui r4 iese direct în kiloohmi.).la tine nici m?car nu mai ai miliamperi prin rezisten?a aia, ai microamperi acolo!!!!

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