Caution: this is not a medical advice
There are just for learning not using unless a doctor prescribes you need one. Severe damage to hearing can be done to a person who does not need a hearing aid but uses one.
http://www.talkingelectronics.com/projects/HearingAid-2/HearingAid-2.html
See also a patented circuit from Oticon:
https://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=2&ND=3&adjacent=true&locale=en_EP&FT=D&date=19730424&CC=US&NR=3729588A&KC=A
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