Help me to design the Audio Amplifier

Discussion in 'The Projects Forum' started by sudharshan.panduranga, May 12, 2008.

  1. sudharshan.panduranga

    Thread Starter Active Member

    Apr 10, 2008
    61
    1
    Hi.....
    I am new to this website. I have to design the Audio amplifier with transistor. pls give solution to the following specification.
    sterio Amplifier.
    Wattage: 50Wrms
    Input resistance: 50K ohm
    Amplification factor: 20
    Output resistance: 4ohm.
    signal to noise ratio:<1db
    Powersupply:36VDC.

    pls give immediate solution.
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    When you say "please give immediate solution," what exactly do you mean? Is this a homework assignment which is due right now?
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    Any limit on quantities of transistors used?
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Another Q would be - what type of transistors to use?

    US-spec transistors aren't available everywhere. Europe and Asia seem to have different kinds available.
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The signal to noise figure is interesting - is this because the power supply is unfiltered, or is the signal source Edison wax cylinders?
     
  6. roddefig

    Active Member

    Apr 29, 2008
    149
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    Heh, agreed!
     
  7. Audioguru

    New Member

    Dec 20, 2007
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    The output noise level must be almost as high as the signal output level.
    I think a pink noise generator must be included for it. Then it needs an audio mixer at its input.

    50W into 4 ohms is a sine-wave with 40V p-p. From a supply of only 36V then the volume must be turned up too high to make 50 Whats worth of square-waves.

    I think the spec on another website says it must have a class-A heating output.
     
  8. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    12
    A single-ended supply of 36VDC would allow for 18V peak.

    50 watts peak would be 14.1V, with enough left over for headroom.

    14.1V * 0.707 = 10V = 25 watts RMS.

    An S/N of >1dB would be a slightly better spec? Please provide immediate response.
     
  9. roddefig

    Active Member

    Apr 29, 2008
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    What website are you referring to?
     
  10. Audioguru

    New Member

    Dec 20, 2007
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    896
    Peak power is measured in Whats. I thought the amplifier has a rating of 50 Watts.

    I chat on 6 electronics chat sites. This thread is on a couple or on a few of them like many NOOB threads are. Sometimes different students in a class have the same question on different websites.
     
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