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Problema fan controller


davidut5
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Salutare.

 

Am realizat un fan controller cu bd441 si potentiometru de 50k, problema este ca actioneaza doar la sfarsitul potentiometrului, intr-un sfert de tura variaza voltajul de la 11v cat e maxim la 3-4v cand ventilatorul se opreste, celelalte 3 sferturi de tura nu face nimic. Exista o rezolvare, fara a schimba tranzistorii?

Am mai facut unul cu bd 139, si acela mergea bine, adica varia voltajul pe 3 sferturi din rotatia potentiometrului.

 

Schema este asta http://www.mygarage.ro/attachments/pc-t ... -bd237.jpg

 

Sau http://www.mygarage.ro/attachments/pc-t ... hema-1.jpg

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Guest Gabi M

Cel mai simplu inlocuieste potentiometrul cu unul de valoare mai mica in serie cu o rezistenta fixa, in asa fel incit valoarea totala sa fie de aproximativ 50k.

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