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Re:$1 hearing aid could treat millions with hearing loss by magicalhippo on Thursday September 24, 2020 @10:10AM (#24578747)
Actually it uses two IC's and the more interesting one, in relative terms, is the MAX9814[1] microphone amplifier with automatic gain control.

I suspect there are cheaper class-D IC's that could be used than the MAX98306, but for a prototype why not.

It also puts the volume control potentiometer on the amplifier output which seems wasteful for a battery operated device.

[1]: https://www.maximintegrated.com/en/products/analog/audio/MAX...

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