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So, it appears that many of the problems may be related to lack of power. Supplying external power to the circuit corrects the issue–but I have not exceeded 2.75V, and again, was sternly cautioned not to go much above this.
Please share your experiences, I’d like to hear if other people have success, too.
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Very useful information. Hope this could be written into FAQ.
By the way, why not tune the volume via application into maximum level instead of adding additional power supply?
thanks,