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Spenningsregulator – MJwiki

Spenningsregulator

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Eksempel med +12V trafo og gjennomgående høy spenning

Spenningsregulatoren til høyre gir regulert +5V og kan brukes til komponenter som trenger regulert +5V Vcc. En likerettende trafo med utspenning på minst +7,5V er nødvendig.

Den er bygget opp av en 1N4001 (1N4002 kan også brukes) diode mellom 0V inngang og strømregulaturbrikke 7805s midterste ben. Med skriften mot deg, som på bildet, er venstre ben inn (>+7,5V) og høyre ut (+5V). Bruk en trebent (tofarget) rød/grønn lysdiode, og kobl det korteste (venstre/grønne) benet til +12V via en 550Ω motstand, det mellomste (høyre/røde) benet til +5V via en 150Ω motstand og det lengste (midterste) benet til 0V. Lysdioden vil da lyse rødt ved for høy spenning, grønt ved for lav og gult (rødt/grønt) ved normal spenning.

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