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Octophonic beeping system needs advice!!!

Discussion in 'Electronic Design' started by [email protected], Feb 10, 2007.

  1. Guest

    Hi!
    I'm building an octophonic beeping system and I could need some help.
    My first prototype was using a basic stamp 2, with 8 pins connected to
    8 speakers which worked but the sound wasn't loud enough and it was
    taking too much pins of the microcontroller.
    I decided to rectify this problem by using only 1 pin of the basic
    stamp for the sound output and connected it to an LM386 for
    amplification.
    The output of the amp was then connected to an ADG508 (8 channel
    multiplexer) and then off to the 8 speakers.
    New problems: the ADG508 (powered with 12volts) reduces the volume
    that the amp amplified.
    Any hint of solution ?
     
  2. Eeyore

    Eeyore Guest

    Yes. The on resistance of the DG508 is what's causing the loss of volume.

    You could use relays instead or an MCU with more pins.

    Graham
     
  3. Guest

    Thanks for the insight. I hadn't tought of relays mainly because I
    wanted fast and silent switching. As for the MCU, you're rightI'll
    probably go with something better. But isn't there a way to only use
    one LM386 instead of eight? If I'd use a demultiplexer instead of
    using the adg508 "in reverse", do you think it'd work better?

    Hugo
     
  4. Guest

    I'll look into that On resistance thing and try a 74HC4051. It might
    just work.
     
  5. Eeyore

    Eeyore Guest

    It's still about 50 ohms.

    If you have the volts to drive them with, a J108 jfet will do much better = Ron
    is 8 ohms max.

    Graham
     
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