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People who develop a hearing loss fflose the high audio frequencies. Therefore a hearing aid must use equalization to boost high frequencies enough, not just amplify all audio frequencies.
I would use a TDA2822M IC but only for the output IC.
With mono the person cannot hear sounds from different directions. But if you want mono then use the circuit you show, or make a stereo amplifier and connect together its two inputs.As per audioguru, I choose TDA2822M.
I can change its mono configuration to stereo easily,but- it can
only input through two channels only.
Most hearing aids are directional so that they do not pickup background noises.How can I configure a commercially available hearing aid circuit
that can absorb all surrounding sounds around patient within reasonable range?