Abstract:
Hearing aid device is a small electronic gadget that is fit in or behind the ear to improve one’s
hearing and consequently communication ability.This research work involves the design and development of a
hearing aid device withpre-amplifier; an acoustic signal picked-up using a condenser microphone. TDA 2822M
IC is configured to produce an audio amplification which is converted to audio signal through a headphone.
Design equations were employed to calculate the physical parameters of the circuit. After the design, the circuit
was constructed and tested on 5 people with partial hearing problem. The result showed that there was a
significant improvement in the hearing ability of all the patients tested. Recommendations were proposed for
further improvement.
