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Help with circuit diagram please

Discussion in 'Electronic Basics' started by Ace, Apr 7, 2005.

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  1. Ace

    Ace Guest


    I have a slightly unusual project I wonder if someone can help with. I
    need to customise a guitar to include 20 4.8v 3A torch batteries. They
    will be powered by 2 4.5V Alkaline batteries, the tricky bit is that i
    need the lights to flash on and off in groups of 4 or 5. Basically I
    think i am looking at having 4 or 5 loops of lights presumambly in
    serial, connected to 4 or 5 channels. What I am lacking is a simple
    controller to switch channels on a timer (once per second would be
    about right)

    I think the controller itself should be relatively simple but I don't
    know how to design it. Can anyone email me a basic diagram and list of
    components i would require? The 2 principle considerations are that it
    would need to be basic as I am not an electrician, and secondly that it
    would be fairly compact as it needs to fit in a guitar.

    Any help would be greatly appreciated!

  2. Lord Garth

    Lord Garth Guest

    Link us to these 20) 4.8V 3A batteries! That sounds real strange. I don't
    think you're communicating well enough. 4 or 5 channels running 4 or 5
    simultaneously or sequentially? What does each channel do? Does each
    respond to a different frequency range or do these groups of lamps simply
    turn on
    one channel after another at a 1Hz rate?
  3. Ace

    Ace Guest

    Sorry my mistake. the bulbs are 4.8v 3A. There are 20 lights I want to
    install on the guitar, my idea is to have a 4 or 5 channel controller,
    each channel operating a group of 4 or 5 lights so that a different
    group of lights flashes on every 1 second. The lights would only need
    to operate for 5-10 minutes so battery life shouldn't be a major

    I hope this calarifies
  4. Lord Garth

    Lord Garth Guest

    Much better, thanks...

    My first suggestion would be to substitute high brightness white LEDs for
    the (I think) incandescent bulbs. First, LEDs are more reliable and use
    less current which makes them easier to use with electronic switching.

    What sort of power source do you have available? It would help to have
    the type of battery, its chemistry and its approximate mAH rating. If you
    use an array of batteries, the final voltage needs to be known as well.

    The basic circuit would be a 555 oscillator outputting a 1Hz pulse followed
    by a divide by 4 or 5 counter and then a decoder. This basic circuit has
    several places where it can be made better / different. For instance, the
    counter / decoder could be replaced with a cheap micro which has been
    to walk an output exclusively among 5 outputs or the counter / decoder
    be replaced with a simple shift register where the final output is looped
    back to
    its input. You just have to power up setting one stage while resetting the
    All are easy to build but I suspect wiring the guitar will be more

    What all of these three possibilities have in common is the need for a final
    driver to actually fire the lamps. If you decide to lose the incandescent
    and go with the LEDs, so much the better.

    The lamps should be connected such that the wiring is minimized. 5 lamps in
    groups means 10 wires so I suppose it's good that you want each groups lamps
    all on at the same time.
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