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LED circuit ideas needed

Discussion in 'LEDs and Optoelectronics' started by v12mcs, Jun 21, 2011.

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  1. v12mcs


    Jun 21, 2011
    Hi everyone im after a circuit if anyone can point me in the right direction.

    i want to make a set of around 6 green leds to pulse and glow from dim and building up to full brightness and back down again in a constant cycle.

    Also im after it in two sizes one can be quit compact and driven either by aa batteries or a pp9 whatever makes the circuit easier really.

    Another i think being driven by cr2032 batteries and staying around that size for the whole assembly if possible.

    Thanks in advance:)
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    The easiest approach would be to wire them in 2 strings of 3 LEDs and power them by 2 x CR2032 batteries. Use a pic (it will need something to reduce the voltage) with a PWM output to switch the LEDs on and off. Set the frequency to around 1kHz and program the PIC to vary the mark/space ratio from 0 to 100% over whatever time period you desire.

    It is quite feasible with SMD parts to make this on a board about the size of one of the batteries.
  3. v12mcs


    Jun 21, 2011

    That sounds good but would be able to give me that in a more basic form as I’m ok with ohms law and wattage power but there was a few acronyms I don’t understand

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