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February 21, 2018, 11:02:52 PM
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| | |-+  Can anyone give me some suggestions on this circuit design?
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Author Topic: Can anyone give me some suggestions on this circuit design?  (Read 5390 times)
qbgjkls
Famiclone
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Posts: 3


« on: March 23, 2017, 08:02:57 AM »

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.



At first ,my questions are:

Is this a reasonable design?

How do I determine the resistor settings for both the base transistor resistors (2N3904), 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!
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famifan
Twin Famicom
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Russian Federation Russian Federation
Posts: 941



« Reply #1 on: March 23, 2017, 04:25:02 PM »

hi, can you share the bigger circuit schematic picture? i can barely see anything.
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