Drive multiple LED with one PWM

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  1. - 27th September 2007, 09:56 #1
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    Question Drive multiple LED with one PWM

    Hi all!
    I want to regulate brightness of 6 LED at the same time with one PWM modulated output from a PIC 18F1320. What kind of driver can I use? Every LED has about 30mA current consumption.

    Very Thanks!,
    Francesco
  2. - 27th September 2007, 12:05 #2
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    Dave
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    microuser . 1 2n3904 transistor with 1K resistor in series with base and connected to your favorite PIC pin. Transistor Emitter connected to ground. Transistor Collector connected to last cathode of 6 series connected LEDs. 47 Ohm Resistor in series with first Anode connection of LED string connected to 12 volts.

    Dave Purola,
    N8NTA
  3. - 27th September 2007, 12:22 #3
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    Thanks Dave!
    What do you think about a BC517 with LEDS in parallel?
    I have to choose the better solution
  4. - 27th September 2007, 13:26 #4
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    one or the other will work. It's not as this critical. BC517 is a darlington. 1 AMP Ic... more than enough.
    Steve

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