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Help with Class D amplifier

Discussion in 'General Electronics Discussion' started by gibon0695, Dec 2, 2015.

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  1. gibon0695

    gibon0695

    27
    3
    Dec 2, 2015
    Hey guys, I'm trying to build this circuit:

    [​IMG]

    I've got it hooked up to a 24V power supply.

    It does not seem to be working properly. My issue is that the sound outputed by the speakers is very quiet, it's a very clear sound, just quiet. I cannot seem to find out why. The speakers are 10W RMS and the output from the chip at 24V (0.5A per channel) is around 8W. So it should be working fine. Input is from my 3.5mm jack connected to an iPod.

    Can anyone suggest a possible reason for this issue? I've checked the connection multiple times... either I'm doing something wrong or there is a bigger issue.

    Here are some images of my circuit (currently only testing on breadboard).

    [​IMG]

    [​IMG]
    [​IMG]

    Thanks Guys
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,993
    2,809
    Nov 17, 2011
  3. AnalogKid

    AnalogKid

    2,573
    740
    Jun 10, 2015
    What are the peak to peak input audio voltage and the peak to peak audio voltage across the speaker? Voltmeters lie; trust a scope.

    ak
     
    Arouse1973 likes this.
  4. gibon0695

    gibon0695

    27
    3
    Dec 2, 2015
  5. Alec_t

    Alec_t

    3,060
    834
    Jul 7, 2015
    What voltage do you have on pins 14 and 15?
     
  6. gibon0695

    gibon0695

    27
    3
    Dec 2, 2015
    I've got pin 14 at 0V and pin 15 at 24V, This produces a gain of 20dB according to the datasheet which is more than enough for what I need. I have also tried both pins at 24V (63dB) and the output is exactly the same (very quiet).
     
  7. AnalogKid

    AnalogKid

    2,573
    740
    Jun 10, 2015
    That's 36 dB, not 63 dB.

    ak
     
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