Audio Frequency Amp

Discussion in 'Homework Help' started by celect, Jun 2, 2005.

  1. celect

    Thread Starter Member

    May 31, 2005
    18
    0
    How do I determine the input signal power if the over all gain = 40db and the out put signal level = 6 watts.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    If I'm correct, you can look at the dB scale numbers as exponents. That would mean your gain is four orders of magnitude (10 to the 4.0 power). If that is the power gain, divide your 6 watts by 10,000 and there you are.
     
  3. n9xv

    Senior Member

    Jan 18, 2005
    329
    1
    Gain factor = 10 raised to the exponent (dB-gain / 10)

    So,

    10^(40/10) = 10^4 = 10,000

    Therefor,

    Input power = 6/10,000 = .0006 or 600-uW (microwatts)
     
  4. davidand

    Active Member

    Jun 2, 2005
    43
    0

    thanks for info, I now understand the text.
     
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