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Topic: Help with schematic (changing GND to 6v) (Read 1 time) previous topic - next topic

sonnyyu


I can't understand what all the fuss is about, run your LED with the correct resistor, switched by the mosfet (or BJT your choice) and change the PWM duty to alter the brightness - Done!


good point, however above circuit is much more flexible, you could connect 1*3V/700mA LED, or 2*3V/700mA LEDs or 3*3V/700mA LEDs  up to 4 LEDs without change anything.

Pancra85

So if I only need to connect just one colored 10 watts led per driver do you think it's better to just have R1 and Q1?? Something like that?
One thing I noticed is that with a low width PWM (when the color should be off) it blinks a little. What do you think about that?

sonnyyu

#17
May 04, 2013, 05:01 pm Last Edit: May 04, 2013, 05:38 pm by sonnyyu Reason: 1

So if I only need to connect just one colored 10 watts led per driver do you think it's better to just have R1 and Q1?? Something like that?
One thing I noticed is that with a low width PWM (when the color should be off) it blinks a little. What do you think about that?


efficiency:  
1 LEDs  ~25%
2 LEDs  ~50%
3 LEDs  ~75%
4 LEDs  ~90%

Use one LED is not green !  anyhow  the answer is Yes, plus big heat sink.
blinks a little, I have no experience, my best bet is play with frequency of PWM.

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