I have the following circuit designed to drive 3 PWM pins off a 3v3 Arduino Pro Mini -- one pin for each of R, G, B in this set of 5 RGB LEDs.
(http://forum.electronicsforu.com/filedata/fetch?id=35851&d=1486545221&type=full)
At first ,my questions are:
Is this a reasonable design?
How do I determine the resistor settings for both the base transistor resistors (2N3904 (http://www.kynix.com/uploadfiles/pdf8798/2N3904.pdf)), and the LED resistors?
Is there a way to simplify/minimise on power wastage, resistor usage, etc?
Then I looked into some books and websites and I figured out some ideas.But I'm not sure if I'm right.
So please give me some suggestions.Thanks a lot!
hi, can you share the bigger circuit schematic picture? i can barely see anything.