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Thread: implementing meters

  1. 03-29-2003 04:37 PM #1
    rafafredd
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    I donīt know exactly hou to implement a meter in my mic preamp...

    Is it possible to put a meter before the first stage of the preamp, to measure the microphone input level?

    In the outputs, I would like to know how to calculate the relation between:

    Meter microvolts sensitivity
    Resistor value to subtract line levels
    Dbm Audio level

    Is there a formula to calculate such things?

    Sorry if you find this a silly question!
    Thanks.
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  2. 03-30-2003 11:23 AM #2
    Kev
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    Is it possible to put a meter before the first stage of the preamp, to measure the microphone input level?
    simple and quick answer ... NO :(


    Dbm Audio level
    0dBm=1mW across a 600 ohm load

    Meter microvolts sensitivity
    +4 = 1.23 V ( 0 = 0.707 V ... ?? I've gone blank ?? )

    Resistor value to subtract line levels
    Use a simple divider.

    For more on this do check out the Home-made LA-2a VU meter thread.

    http://www.recording.org/cgi-local/u...c;f=6;t=000951
    Kev
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