cearda Posted April 25, 2016 Share Posted April 25, 2016 Am 5v,cum fac sa scot 3.3v ? Daca se poate sa fie cat mai simplu. Multumesc. Quote Link to comment Share on other sites More sharing options...
Voltus Posted April 25, 2016 Share Posted April 25, 2016 LM317 daca e nevoie de max 1A . Quote Link to comment Share on other sites More sharing options...
lutza2 Posted April 25, 2016 Share Posted April 25, 2016 AMS1117-3.3 Quote Link to comment Share on other sites More sharing options...
Florian Ciobanu Posted April 25, 2016 Share Posted April 25, 2016 http://hobbymarket.ro/index.php?main_page=product_info&products_id=359 Quote Link to comment Share on other sites More sharing options...
8429kyd Posted April 25, 2016 Share Posted April 25, 2016 Cred ca cel mai ieftin e sa pui 2-3 diode cu siliciu in serie(0,6v-0,7V cadere tensiune pe ele) sau diode Schottky dar trebuie mai multe ca au cadere de tensiune mai mica.(0,3V)Daca e musai sa iasa 3,3v atunci colegul lutza2 te-a indrumat bine ca varianta ieftina si simpla. Quote Link to comment Share on other sites More sharing options...
of-of Posted April 26, 2016 Share Posted April 26, 2016 Depinde de ce curent e nevoie acolo si ce precizie. Erau si diode Zenner de 2,7V, 3,6V, parca 3,4V? Pentru un curent mititel o dioda de 2,7 inseriata cu una normala si o rezistenta de 33 ohmi sunt suficiente. Quote Link to comment Share on other sites More sharing options...
GEO 53 BN Posted April 26, 2016 Share Posted April 26, 2016 Au fost si inca mai sint diode Zenner de 3,3V atit de 0,5W cit si de 1,3W. Quote Link to comment Share on other sites More sharing options...
Marian Posted April 26, 2016 Share Posted April 26, 2016 LM317 daca e nevoie de max 1A . De la 5 pana la 3,3 diferenta este de 1,7V, 317 are nevoie de mai mult pentru a stabiliza corect. Nu s-a precizat daca cei 5V sunt stabilizati sau nu, nu s-a precizat nici ce curent este necesar de la cei 3,3V, ci doar s-a prezentat o intrebare generalizata, prin urmare si raspunsuri la fel de generaliste. Quote Link to comment Share on other sites More sharing options...
ilzul Posted April 26, 2016 Share Posted April 26, 2016 Poti folosi si divizor de tensiune. La fel, daca nu e specificat curentul, degeaba iti dam exemple. Quote Link to comment Share on other sites More sharing options...
Florian Ciobanu Posted April 26, 2016 Share Posted April 26, 2016 n-o fi sondaj de opinie? Quote Link to comment Share on other sites More sharing options...
kinderu56 Posted April 26, 2016 Share Posted April 26, 2016 lm1084s-3.3v/5A Quote Link to comment Share on other sites More sharing options...
Marian Posted April 26, 2016 Share Posted April 26, 2016 Buck cu MC34063, un integrat cu 8 pini ieftin plus cateva componente tot ieftine pe langa el... Quote Link to comment Share on other sites More sharing options...
kinderu56 Posted April 26, 2016 Share Posted April 26, 2016 cel mai eftin cumpara un incarcator auto de tel de prin talcioc si gaseste in el mc34063 modifica doua rezistente si gata sursa Quote Link to comment Share on other sites More sharing options...
ratza Posted April 26, 2016 Share Posted April 26, 2016 La fel ca ilzul, şi eu zic să nu vă mai obosiţi cu răspunsuri pînă nu spune clar pentru ce aplicaţie îi trebuie. Quote Link to comment Share on other sites More sharing options...
cearda Posted April 26, 2016 Author Share Posted April 26, 2016 (edited) Am nevoie pentru un ecran,am pe placa (main board) 5v,in loc de 5v am nevoie de 3.3v.Am nevoie la alimentarea ecranului lcd de 3.3v. Pot folosi asa ceva ? Mai trebuie ceva piese ? Edited April 26, 2016 by cearda Quote Link to comment Share on other sites More sharing options...
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