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Mix2052 audio chip

Discussion in 'Audio' started by Liamjames192, Feb 29, 2020.

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  1. Liamjames192

    Liamjames192

    1
    0
    Feb 29, 2020
    I enjoy building small amps. I am having trouble with the MIX2052 class D amp.
    The amp clips at higher levels. Does anyone know any filters are any other way to eliminate this clipping sound?
     
  2. bertus

    bertus

    346
    112
    Nov 8, 2019
    Hello,

    The Mixinno datasheet of the chip is in chinese.
    I do not read chinese.
    I see the chip has a gain of about 20 dB.

    Bertus
     

    Attached Files:

    Last edited: Feb 29, 2020
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    9,668
    2,019
    Nov 17, 2011
    It is not unusual for an amplifier to clip at high levels. What are the "higher levels" you refer to?
    Once the amplifier has clipped, you cannot remove the clipping effect by filtering. Clipping introduces harmonic frequencies which may well be within the audio range of frequencies. Filtering these will distort the frequency response of the amplifier.
    Show us your circuit diagram.
     
  4. hevans1944

    hevans1944 Hop - AC8NS

    4,379
    2,046
    Jun 21, 2012
    This Class D Chinese amplifier apparently creates a differential (bridged?) pulse-width modulated output with a free-running frequency of about 130 kHz. The rate at which this PWM output changes duty cycle is a function of the frequency of the input signal. The amount of duty cycle variation of the PWM output is a function of the amplitude of the input signal. This particular Class D amplifier does not have any filtering of the 130 kHz PWM output signal, which is required for Class D audio operation. It looks to me like the manufacturer is depending on the inductance and mass of a directly-connected moving-coil speaker to perform the low-pass filtering that will remove the 130 kHz PWM signal, leaving a suitably integrated time-averaged audio signal. Most everyone else uses actual coils and capacitors to perform this filtering.

    So, with all this in mind, just HOW exactly do you determine WHEN clipping occurs, WHAT level of input signal is required for clipping, and WHERE do you measure the clipping? Your Golden Ears may give you a clue that something ain't quite right when music sounds okay at low levels and awful when you crank the volume up, but they are subjective, not quantitative, test equipment. It is possible to design a highly efficient (90% or more) Class D amplifier that is also a hi-fidelity amplifier, but I doubt this Asian knock-off falls into the category of hi-fi. The "clipping" you hear is probably normal for this amplifier. Reduce the input signal amplitude until the signal sounds more or less acceptable to your Golden Ears, or consider purchasing a better Class D amplifier. No suggestions from me on that.

    The last Class D amplifier I purchased and received (for use in driving a large vacuum e-beam furnace hearth) was sent back to the manufacturer because it was obviously a prototype, but more importantly because it didn't work. The replacement that was sent was less obviously a prototype, but it didn't work either. Bear in mind that this particular Class D amplifier was allegedly designed to work with our e-beam hearth so we would have PID control of the power input and, hence, deposition rate of refractory substances sublimated from the hearth. I guess it was just as hard to design and build a good Class D amplifier in the previous century as it appears to be to do today... although the automobile manufacturers seem to have it nailed.
     
    Last edited: Mar 1, 2020
  5. Audioguru

    Audioguru

    2,743
    621
    Sep 24, 2016
    This is the third website this thread is on.
    In the first website the battery was 3.7V, in the second website there was a 5.1V power supply used. The datasheet for the amplifier shows very low distortion (0.04% or less) below clipping but it is rated at 6W (Whats, not Watts) with a 5.5V supply into a 2 ohms load with 10% of horrible clipping distortion. With the 3.7V battery and the 4 ohm speaker in the first thread the power is 0.8W with low distortion.
    He probably wants 10W or more.
     
  6. aurelZ

    aurelZ

    75
    7
    Jun 10, 2019
    I really don't know why people expect good amps from such a small chip
    I doubt that can produce more than a 1Watt( What?) with 10% of thd
    better build classA amplifier with one MOSFET....
     
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