![]() ![]() This IC, specially designed for portable low-power applications, is readily available in 8-pin mini DIP package. The medium-power amplifier section is wired around popular audio amplifier IC TDA2822M (not TDA2822). Medical grade hearing aids are very expensive, if a person needs help hearing but not necessarily the full cost and capability of a prescribed hearing aid, this might be an option. Transistor T1 and associated components form the audio signal preamplifier for the acoustic signals picked up by the condenser microphone and converted into corresponding electrical signals. ![]() This low-cost, general-purpose electronic circuit works off 3V DC (2×1.5V battery). This circuit could be helpful for some types of hearing loss and occasional use, as well as fill in during the average amount of time people wait to get a hearing aid (7 years). Amplification of all sounds and frequencies, or constant use in loud environments can cause additional hearing loss. It is not a substitute for a real hearing aid that an audiologist would prescribe. This is a less expensive, and DIY option for a hearing aid. ![]()
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