The problem with the amplifier with TDA7294

Discussion in 'General Electronics Chat' started by Petrus Armagedon, Oct 10, 2011.

  1. Petrus Armagedon

    Thread Starter New Member

    Jul 1, 2011
    24
    0
    Hello all!
    I made amplifier with TDA7294 under this schematics (Figure 1-F). When you turn on this amplifier to power Ucc =+/-37V itself humming. When disconnection is powered by 1 to 2 seconds then stops playing well. Of its output is switched 80W speaker 8ohm. Please help to solve a problem ... why not amp to work?
    thanks
     
    Last edited: Oct 10, 2011
  2. #12

    Expert

    Nov 30, 2010
    16,252
    6,751
    I see no problem with Figure 1-F. I can only suggest a mistake in assembly.
     
  3. flat5

    Active Member

    Nov 13, 2008
    403
    17
    Since it's probably a construction problem good pictures would be helpful.
     
  4. Adjuster

    Well-Known Member

    Dec 26, 2010
    2,147
    300
    Some other possibilities are as follows:


    1. One or more of the components used to build the amplifier may be faulty.
    2. The power supply may have excessive ripple, causing hum.
    3. The power supply voltages may not be correct.
    4. Connections external to the amplifier may be incorrect, e.g. there may be a ground loop which goes away when the power is cut off.
     
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