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Stereo 20W Class D Audio Amplifier - MAX9744
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Stereo 20W Class D Audio Amplifier - MAX9744

by L00zer on Sat May 15, 2021 8:39 pm

Hi I purchased this amp and wired it up and everything worked awesome. Nice sound as well, was surprised. However in time there started to have a low buzz noise coming out of the speaker hours after listening to music. I disconneced the music source to check if that was sending some sort of signal to the amp. This didnt stop the buzz noise. Have to uplug the power supply and then connect again. It eventually happens again, and sometimes at this point unlugging doesnt stop it and I have to play music. My power supply is an old cordless phone plug 9v. Is this board bad or is it just the way it is? Other thsn this, this was pretty surprisingly good. Thanks for any help.

L00zer
 
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Re: Stereo 20W Class D Audio Amplifier - MAX9744

by adafruit_support_mike on Mon May 17, 2021 8:23 pm

What's the power rating of the speaker connected to the MAX9744? It's possible the speaker has been overdriven and damaged.

adafruit_support_mike
 
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Re: Stereo 20W Class D Audio Amplifier - MAX9744

by L00zer on Tue May 18, 2021 2:28 pm

The speaker is an in ceiling speaker rated to 150 watts. The speaker is DEFINITELY fine, the noise is some sort of low signal type thing. When I unplug the source from the amp it is still there. I am thinking of switching from the 9volt to a 19 volt laptop power supply to see if any effect. Once music is playing its fine, but unfortunatelly I can not play music all night long.

L00zer
 
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Joined: Sat May 15, 2021 8:26 pm

Re: Stereo 20W Class D Audio Amplifier - MAX9744

by adafruit_support_mike on Tue May 18, 2021 6:27 pm

Post a photo showing your hardware and connections and we'll take a look. 800x600 images usually work best.

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Please be positive and constructive with your questions and comments.