This Low Cost Hearing Aid project is built based on TDA2822M IC. This general-purpose electronic hearing aid needs 3V DC (2×1.5V battery) to works. Use an 8-pin DIP IC socket for TDA2822M for easy assembling and maintenance. Simple & Low cost hearing Aid Schematic Part List: P1 = 10K R1 = 2.2K R2 = 330K [...]
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