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Building an Audio Amplifier

Discussion in 'Audio' started by krips, Apr 8, 2015.

  1. krips

    krips

    1
    0
    Apr 8, 2015
    I'm currently working on building an Amplifier for a desktop speaker. I have created my circuit but need help analyzing the circuit. I am using a class AB amplifier and wanting to achieve a power of 5WRMS in my output using my phone as input signal. I am unsure of how to analyse the circuit and what values i need to achieve this. I have posted a picture of my circuit. If anyone can help me analyse or provide suggestions to improve that would be greatly appreciated.
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,328
    1,769
    Sep 5, 2009
    hi krips

    welcome to EP :)

    I would be very surprised if you would get 5W from a 3904/3906 pair
    why don't you use a IC amp like a TDA 2030 or similar would be so much easier :)

    Dave
     
  3. ramussons

    ramussons

    342
    61
    Jun 10, 2014
    The R6 connected to Q2 will result in a +ve feed back leading to Instability / Oscillations / Output DC latch up. R6 should go to base of Q1 and not Q2.
     
  4. BobK

    BobK

    7,643
    1,662
    Jan 5, 2010
    Like Dave said, the transistors you are using will not produce 1W, let alone 5W. You would need power darlingtons to output that much power.


    Bob
     
  5. Colin Mitchell

    Colin Mitchell

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    314
    Aug 31, 2014
    You can buy a 3w amp for $5.00 post free on ebay
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009
    Colin, I'm getting really annoyed with your ongoing posts like this without providing links to the eBay page
    If you continue to do this I will just delete your posts.
    Now provide a link to this eBay reference !!

    Dave
     
  7. Colin Mitchell

    Colin Mitchell

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    Aug 31, 2014
  8. davenn

    davenn Moderator

    13,328
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    Sep 5, 2009
    thankyou
     
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