relation between noise and power consumption

Discussion in 'General Electronics Chat' started by saghar19, Jan 15, 2013.

  1. saghar19

    Thread Starter Member

    Jul 16, 2012
    38
    0
    Hi
    Is there any relation between noise and power consumption?
    If yes,what is it?How the noise affects power consumption?
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    The amount of noise I make rises as the square of my family's power consumption.
     
    Last edited: Jan 15, 2013
  3. saghar19

    Thread Starter Member

    Jul 16, 2012
    38
    0
    Is it an answer to my question!!!!!!!:eek:
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Noise from what?!!!!!!!:eek:

    A single transistor can have a voltage gain as high as about 180 and it amplifies its own noise. Its noise is very low so its output level of the noise is very low and will not increase its power consumption.

    A power amplifier can amplify mains hum noise and produce a high output power to a speaker. Then its power consumption is high.
     
  5. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    Low noise circuits like preamps typically use larger quiescent current, because noise roughly rises as the impedance rises.
    But the main question is noise WHERE? and power consumption of WHAT circuit?
    For example electrical noise on primary produced by a switching converter could rise with load power.
     
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