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Regulator napięcia 1-12V. - Forum Elektroniczne

Regulator napięcia 1-12V.

Początek przygody z elektroniką. Teoria, sprawozdania, proste projekty.
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Krzyzan5
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Regulator napięcia 1-12V.

Postautor: Krzyzan5 » sob 09 lis 2013, 21:27

Witam.
Potrzebuję pomocy, a mianowicie przygotowałem schemat i chcę regulować napięcie 12V podane z zasilacza ATX w granicach 1 do 12 V.
Potencjometr 1 kOhm.
Regulator.png
(3.42 KiB) Nie pobierany

Czy to zadziała tak jak powinno?

rallus
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Re: Regulator napięcia 1-12V.

Postautor: rallus » sob 09 lis 2013, 23:26

Niestety nie zadziała tak jak byś sobie tego życzył.
Przy takich wartościach elementów zakres regulacji wynosi od około 3,9V do około 10,18V.
I to pod warunkiem, że napięcie wejściowe będzie większe od wyjściowego o co najmniej 3V.
W podstawowej aplikacji układu nie zejdziesz z napięciem wyjściowym poniżej napięcia odniesienia to jest około 1,25V.

Krzyzan5
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Re: Regulator napięcia 1-12V.

Postautor: Krzyzan5 » ndz 10 lis 2013, 0:00

Ehhh :/ Tego się obawiałem :/
Więc jak mógłbym regulować w pełni? :)

rallus
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Re: Regulator napięcia 1-12V.

Postautor: rallus » ndz 10 lis 2013, 14:36

Aby zwiększyć zakres regulacji musisz zmienić wartość potencjometru R3 a rezystor R1 zlikwidować.
Eliminując rezystor R1 zejdziesz z napięciem wyjściowym do minimum czuli około 1,25V.
Aby podnieść zakres regulacji do góry musisz zwiększyć wartość potencjometru R3.
Ale i tak przy napięciu zasilającym równym 12V nie osiągniesz całego zakresu regulacji od góry.
Każdy stabilizator do prawidłowego działania potrzebuje napięcia wejściowego wyższego niż wyjściowe.


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