180W Hi-Fi Class B Amplifier

Discussion in 'The Projects Forum' started by Vladislav Damqnov, Aug 31, 2015.

  1. Vladislav Damqnov

    Thread Starter New Member

    Aug 31, 2015
    2
    0
    Some of the specs are:

    - Input sensitivity - 3Vpk-pk for full output
    - Frequency response - 1Hz - 24Khz@-3dB
    - Gain - fixed at 29 (32dB)
    - Output Power - 180Wrms/4ohm
    - Power Consumption - 239W
    - Efficiency - 75%
    - Ripple rejection - very good at -62.7dB
    - THD+N - 0.013% @ 180Wrms/4ohm

    The 6 output transistors are 2N3055 and MJ2955 or a close equivalent. All 220mOhm resistors are wirewound or rated 5W at least. The 56ohm resistors are 1W and their driving transistors are BD139 and BD140

    The second circuit is the Power Supply circuit (bridge and filtering) for the amplifier. The transformer is 110V(220V) - 35V - 0 - 35V. Recommended capacitor size 2x10mF. Any less and you risk deteriorating the overall quality and/or self oscillations.

    The preamplifier requires perfect regulation. I suggest LM7812 and LM7912 in the highest ripple rejection topology possible. The ripples should be no more than a couple of mV.
     
    Last edited: Aug 31, 2015
  2. Wendy

    Moderator

    Mar 24, 2008
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    2,536
    Almost there. You need to post a picture of the completed project to show how it lays out. A BOM (Bill of Materials) would be nice, but not required.

    This post will be removed when you post the required picture, else this post will be moved to the Projects Forum at a later date.
     
  3. Vladislav Damqnov

    Thread Starter New Member

    Aug 31, 2015
    2
    0
    I have it on simulation. Haven't had the chance to build it yet, although it ,,lays out'' perfectly in simulation. I am using EveryCircuit to simulate it.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Then it is not a Completed Project. When you build it feel free to resubmit to this forum.
     
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,534
    1,251
    You should add reference designators to the components to aid discussions about the circuit. Also, you have a transistor as an active zener setting up static boas current through the output stage, so the circuit is class AB. This is better.

    ak
     
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