Interference on Music Maker MP3 Shield for Arduino w/3W Ster

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ukmaker
 
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Interference on Music Maker MP3 Shield for Arduino w/3W Ster

Post by ukmaker »

We have a problem with the amps on the Adafruit Music maker shield w 3W stereo amp (P1788). The boards have been assembled the same way many times before, soldering the header pins on and soldering wires onto the amplifier connections and then put onto an Arduino Uno. We have loaded sounds on a card and loaded the program as normal and all works fine on headphones. However, when the speakers are connected (again ones we have used on this board before) there was some strange behaviour. Placing a hand in proximity of the shield affects the sound, usually by introducing hiss. Using the USB power from the Uno the quality of the sound was generally ok but on the barrel jack it was not and buzzed in addition to the proximity effect. We have verified this on two other boards from the same batch (W5095-A) and has the exact same problems. In addition, we tested the exact same setup (Arduino & Speakers) on one from another batch (W4393-A) and there were no issues at all.

Videos:
Working W4394-A batch: https://drive.google.com/open?id=181f_m ... 96UrBVawGg
Not working W5095-A batch: https://drive.google.com/open?id=1n69aC ... zvt2QmsFJR

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adafruit2
 
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Re: Interference on Music Maker MP3 Shield for Arduino w/3W

Post by adafruit2 »

can you take a look at the amplifier chip? we had to change chips when the old one got discontinued - the part numbers/markings would vary!

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ukmaker
 
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Re: Interference on Music Maker MP3 Shield for Arduino w/3W

Post by ukmaker »

Please see attached photo of an example from Batch W5095-A.
IMG_0514 (1).jpg
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adafruit2
 
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Re: Interference on Music Maker MP3 Shield for Arduino w/3W

Post by adafruit2 »

yah that part didnt change, look for the audio amplifier chip, its near the speaker temrinals :)

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ukmaker
 
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Re: Interference on Music Maker MP3 Shield for Arduino w/3W

Post by ukmaker »

AKS
TI 688
A4FH
IMG_5181.JPG
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adafruit2
 
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Re: Interference on Music Maker MP3 Shield for Arduino w/3W

Post by adafruit2 »

yah thats the modern TI part. we cant get the old part anymore. you may want to look at earth-grounding the arduino. shortening wires. we're great antennas (humans are salty water bags :)

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