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makaveli97

Reductor ventilatoare.

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Salut. Vreau sa reduc turatia unor ventilatoare printr-un reductor. 

Acum ventilatoarele sunt conectate la unul dar mi se pare ca fac putin zgomot si as vrea sa mai reduc din turatie.

Rezistenta reductorului este de 51 Ohmi si este cam de 3W. Amperajul ventilatorului este de 0.3A.

Ce rezistente mi-ar trebui pentru a avea un voltaj de 5v si 6v pe ventilator?

Edited by makaveli97

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Nu vreau sa introduc semiconductoare in peisaj, un rezistor ar fi perfect.

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De ce?

Ma rog,este alegerea dvs. dar varianta cu LM7805 nu presupune nimic "stufos" tot o singura piesa este.

Edited by miron1947

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Un raspuns mai exact venea daca stiam acum Uvent (tensiunea pe ventilator dupa rezistorul de 51)

 

Teoretic ai deja 5V, deci rezistorul dorit

Cand merg "experimental", dublez/injumatatesc valorile -> incearca si 100ohm, apoi mai mic sau mai mare.

 

Explicatie:

initial: 12V/0.3 A >> Rvent=40ohm

Actual: (presupunem Rvent constanta) Uvent = 12*(40/91)=5.27V

Probabil mai mare daca Rvent scade cu tensiunea la borne

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Pai atunci e mai simplu:

5V (12-7) corespund la 51ohm

Pune 60...75 si vezi cum iese

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