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How can I connect 4 microphones to one recorder?

Discussion in 'Electronic Basics' started by MM, Nov 15, 2007.

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  1. MM

    MM Guest

    Here's a picture of what I want to do:

    The tape/cassette recorder (or PC with sound card) would be in one
    room. Its recording connector would be split (somehow) into four, so
    that a microphone could be connected to any of them. Each of, say,
    four rooms would have a flylead connector as shown. I can do soldering
    and use sidecutters.

  2. Tom Biasi

    Tom Biasi Guest

    If you are only going to use one at a time you can just parallel them.
    If you will use more than one mic you would need a mixer.

  3. MM

    MM Guest

    When you say, parallel them, what does that entail? Could I just
    solder the relevant flyleads (inner cores) to, say, a bit of
    Veroboard, then connect that to the recorder?

    Alternatively, the mixer: What would I be looking for? (e.g. Google)


  4. JeffM

    JeffM Guest

    The switch on many microphones shorts out the mic element
    to terminate the line for no added noise pickup.
    This kills *all* the mics if they are paralleled.
    Yup. Will work universally.
  5. Tom Biasi

    Tom Biasi Guest

    He didn't say he wanted to parallel four mics just four connectors.
  6. Tom Biasi

    Tom Biasi Guest

    Parallel means like wires to like wires.
    center to center, shield to shield.

    Google "microphone mixer"
  7. MM

    MM Guest

    That's true. However, now I know about mixers it may be more efficient
    to buy four cheap Maplin microphones and leave them connected. The
    idea is that I speak anywhere (main rooms) in the house and have my
    words recorded. Like Beethoven's notebooks, but a vocal version! An
    alternative might be to have a wearable, *discrete* wireless mic of
    some kind, but whether this would always connect to the recorder
    elsewhere in the house is debatable. Having cables instead of wireless
    would obviate any problem on that score. I tried several years ago
    with one of the first Sony voice-operated digital recorders, but it
    lasted about five minutes beyond the guarantee period. Ruddy thing
    cost me around £130!

  8. Bob Masta

    Bob Masta Guest

    I suspect that you will be unhappy with the results of having all the
    mics paralleled and always active. Since they will be distant from
    your mouth you will have to crank the gain up high to get a reasonable
    response. But that will make them very susceptible to noise pickup,
    so you will be triggering your sound-activated recording on all kinds
    of incidental sounds like the fridge and furnace. The wearable
    wireless mic sound like a much better idea in this regard, but much
    depends on how "discrete" it needs to be. A boom mic right in front
    of your lips would be ideal; a mic clipped to your shirt may
    false-trigger from picking up too much body motion noise.

    I'd recommend that before you proceed, you use a single mic and
    run some tests in a single room. See if you can find a happy
    compromise between gain and noise pickup, then go from there.

    Best regards,

    Bob Masta

    DAQARTA v3.50
    Data AcQuisition And Real-Time Analysis
    Scope, Spectrum, Spectrogram, FREE Signal Generator
    Science with your sound card!
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