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HELP Using caps to briefly ground contact

Discussion in 'Electronic Basics' started by Wendelloni, Oct 27, 2005.

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  1. Wendelloni

    Wendelloni Guest

    I am working on a Halloween project that uses a commercial sound
    system. It's just a little box that plays sounds off Compact Flash
    cards based on certain terminal outputs being grounded.

    (link to EM3028B page:

    Anyhow, for most of the connections I have done the sane thing of using
    momentary push-buttons. But for authenticity reasons, there is one
    terminal that needs to be connected to two toggle switches. In order
    for other sounds not to get "locked out", I can't tie the switches
    directly to ground. So, I used some caps to make the contacts briefly
    go to (near) ground.

    The problem comes from the fact that the switches are turned on in a
    specific order (authenticity again). They activate other systems, but
    share the same sound. The way it is now, if I flip switch 1 or 2
    (numbered by the order they would be turned on), I get the sound. If,
    I flip 2 then 1, I get the sound twice. But if I flip 1 then 2, I only
    get the sound when I flip number 1.

    The ONLY difference is that one switch is five feet from the terminal
    (i.e. has five feet more wire). I tried to use a larger capacitor with
    the switch 2, and when I got large enough it seemed to work but only
    after a delay. I'm hoping there is something easy I can do to get the
    switches to work in the right order. The actual switch mechanisms are
    physically different and cannot be swapped.

    Here's the basic circuit. The resistors are around 200 ohms and the
    caps are 22uF.
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