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Electronics => Electronics => Topic started by: WhomBom on September 22, 2010, 02:38:28 AM

Title: arduino pwm transistor circuit, will this work?
Post by: WhomBom on September 22, 2010, 02:38:28 AM

Hi guys, I thought i'll check my plans with you before i blow something up  ;) hopefully anyone can tell me if they will work

(http://i54.tinypic.com/2qjlobd.jpg)

i want to pwm the led using my arduino, R1 is 200 Ohms, connected to my +5V output pin when i want the transistor to conduct. The +4.1 V can be adjusted to compensate any losses in the transistor (so i can keep the led at 3.3V)

what do you think?

Title: Re: arduino pwm transistor circuit, will this work?
Post by: billhowl on September 22, 2010, 06:39:09 AM

Circuit can be work provided you supply constant current of 350mA to the LED and the transistor having current gain of more then 20.