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help designing a circuit

Discussion in 'Electronic Basics' started by holmsy, Apr 1, 2005.

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  1. holmsy

    holmsy Guest

    what i need is sort of a muting circuit

    i need a cicuit that has two audio inputs(we'll call them 1 and 2) and
    the circuit alows input2 to play continuously untill there is a signal
    from input1 then input2 will be muted while there is a signal coming
    from input1 and then once there is no more signal from input1 it will
    wait for around a minute before it alows sound from input2 again.

    sort of so that you can listen to input2 but as soon as something
    comes from input1 it has priority so that you cant miss it.

    has anyone seen anything like this? does anyone know where i can get a
    circuit diagram for something like that? does anyone have a circuit
    diagram like that?
  2. There are cd players and such for aircraft that do this. When the
    controller talks, it mutes the stereo output. I don't know how they do
    it, but it might be a place to start looking.

    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
  3. BobG

    BobG Guest

    sort of so that you can listen to input2 but as soon as something
    Commercial intercoms have this.... zone paging, priority override....
    You want to build it or buy it? A simple voice operated relay might
  4. Bob Masta

    Bob Masta Guest

    I think what you want is what is sold commerically as a
    "ducking" amp, or typically a ducking circuit on a mixer, or
    compressor. (For annoying DJs to talk over your favorite songs, etc.)
    Basically, you extract the envelope of Input1 (full-wave
    active rectifier with low-pass filter) and feed that to a threshold
    comparator that runs the mute, including adjustable ramps (fast
    fade-down and slow fade-up.)

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
  5. Active8

    Active8 Guest

    Those other guys have good ideas. Bob M touched on what I was
    thinking which is just a plain mixer - if you really don't need that
    mute/delay effect. When I was stationed in Germany, rather than
    annoy people with loud music, I'd mic my acoustic guitar, run the
    electric to the mixer, and there was another omni mic set up to pick
    up people speaking. The tape deck ran into the mixer also. We
    listend with headphones and heard it all.

    So if you need an envelope detector to control a mute circuit, that
    sounds easy. The mute/delay would work similar to an AGC circuit.

    What's the application? You need Hi-Fi or what? What are the audio
    sources and powering requirements?
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