Hearing Aids Circuit

Posted on Feb 5, 2014

This is a less expensive, and DIY option for a hearing aid. It is not a substitute for a real hearing aid that an audiologist would prescribe. Amplification of all sounds and frequencies, or constant use in loud environments can cause additional hearing loss. This circuit could be helpful for some types of hearing loss and occasional use, as well

Hearing Aids Circuit
Click here to download the full size of the above Circuit.

as fill in during the average amount of time people wait to get a hearing aid (7 years). This low-cost, general-purpose electronic circuit works off 3V DC (2G—1. 5V battery). 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. 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. The medium-power amplifier section is wired around popular audio amplifier IC TDA2822M (not TDA2822). This IC, specially designed for portable low-power applications, is readily available in 8-pin mini DIP package. Here the IC is wired in bridge configuration to drive the 32-ohm general-purpose monophonic earphone. The audio output of this aid circuit is 10 to 15 mW and the quiescent current drain is below 1 mA. The circuit can be easily assembled on a veroboard. For easy assembling and maintenance, use an 8-pin DIP IC socket for TDA2822M.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Subwoofer Filter Circuit Using Op-Amp TL072
    jung schematic
    12 Volt DC Fluorescent Lamp Driver
    Commodore 64 Reset Logic
    Free energy generating coil
    A 30 Mtr Direct Conversion Receiver for QRSS
    An Audible Field Strength Indicator for Radio Direction Finding
    Metal detector circuit diagram 6
    120W power amplifier circuit
    Automatic recording telephone interface circuit
    Open water notification Circuit Design
    555 Happy Birthday electronic circuit diagram candle
    Multiple waveform generator circuit diagram
    Discharge time relay circuit