Do Sony Camcorders Mic input need a blocking Cap for XLR Mics?

Discussion in 'Professional Video Production' started by nope, Feb 28, 2004.

  1. nope

    nope Guest

    I am pulling my hair out figuring how to connect my special projects
    SP-5501 shotgun mic with XLR output to my Sony trv900 mic input.

    I have a beachtech box, but only want the extra weight when I have
    more than one mic input.

    I want to go straight from my camera mounted shotgun to the 3.5mm mic
    in.

    I know sonys have the dc 2.5 volt, mic component. A blocking
    capacitor sounds correct in a patch cable like Equipment Emporiums
    XLRH8/DV which " Blocks any stray voltage at camcorder input", but at
    $40 compared to a simple balanced XLR to (balanced?) 3.5mm for
    $13....I'd rather pat $13.

    I only want to buy it if it's necessary and without first trying it I
    can't tell.

    Has anyone used a regular cable from an XLR mic to a Sony mic input
    without hum or other problems?

    Any help is apreciated.
     
    nope, Feb 28, 2004
    #1
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  2. Most consumer and pro-sumer camcorders (and MD recorders,
    etc. etc.) have similar bias voltage on the mini-phone (3.5mm)
    mic connector input.
    If you are handy with a soldering iron, you can add a $1
    capacitor yourself. Not particularly complicated.

    BTW, the voltage isn't "stray" it is intentional! :)
    No way to know for sure without knowing what the output
    circuit of that microphone looks like. I'd use a DC-blocking
    capacitor to be safe. Cheapest insurance available.
    Yes. Like most things, you can "break the rules" if you know
    what you are doing. The problem is not likely to be hum.
    Without knowing how the mic is designed, difficult to predict
    what the symptoms might be.

    Wiring diagrams for DC-blocking cables/adaptors on my web...
    http://www.rcrowley.com/CamAdapt.htm
     
    Richard Crowley, Feb 28, 2004
    #2
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