Posted on Feb 5, 2014

This can also be called a poor man`s hearing aid because it can be constructed from some low cost components although its performance is not comparable to that of commercially available sophisticated hearing aids, still it can serve the purpose well for persons with a low degree of hearing impairment. which have been cascaded to improve gain and s

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ensitivity in most audible range. With 3V supply voltage, you can afford to use 1/8-watt resistors, while the electrolytic capacitors` voltage rating can be as low as 5V. This will allow the assembled circuit to occupy very little space. Apart from the usual battery on`/off` switch S1, muting on`/off` switch S2 has also been provided. Both S1 and S2 could be PCB-mount slide switches.

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