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DESPRE TEHNOLOGIE SI ELECTRONICA-DIY
Reglare intensitate luminoasa LED prin doi tranzistori
Proiectul prezinta un circuit simplu, de exercitiu, pentru electronistii incepatori, reglarea intensitatii luminoase a LED-ului facandu-se cu un potentiometru prin intermediul a doi tranzistori.
Lista de componente necesare:
1 x POT = 10k 1 x R1 = 1k 1 x R2 = 1k 1 x R3 = 1k 1 x R4 = 1k 1 x LED 1 x T1 = 2N2222 2 x T2 = 2N2222 1 x Contact terminal 1 x Placa de test tip breadboard + fire de legatura
Pentru o mai buna intelegere a functionarii circuitului si pentru a realiza acest montaj pe breadboard vom avea nevoie de schema electronica prezentata mai jos:
Cum functioneaza circuitul?
Cu ajutorul potentiometrului POT de 10k, reglam intesitatea luminoasa a LED-ului. R1 si R2 sunt folosite ca rezistente de limitare a curentului in tranzistorul T1. R3 este folosita ca resistenta de limitare a curentului in baza tranzitorului T2 iar R4 este folosita ca rezistenta de limitare a curentului pentru LED.
Cu cat "indreptam" reglajul din POT spre partea pozitiva (+), cu atat intensitatea luminoasa a LED-ului scade. Desigur, daca "indreptam" reglajul din POT spre partea negativa (GND), intensitatea luminoasa a LED-ului creste.
Amplasarea componentelor pe breadboard
Alte materiale educative despre electronica si nu numai..
