A chip is much easier - the TDA7052 works well down to 5V, but its a BTL so not much good for earphones if you need stereo.
My TL431 electret capsule booster was published in Elektor a few years ago - someone here has a link to an online copy of the article.Thanks guys. I Will try the veracohr suggestions. This Circuit comes from a spy ear toy. I wanted to have much gain. I am working to a hearing empaired project
The TDA7052 I suggested in an earlier post uses the absolute minimum of external components.I know how, as a beginner, it seems easier to use discrete components. This is not true, and I encourage you to look at integrated circuits. Yes they are complex on the inside, but that is not your problem. They are designed by teams of experts to do exactly what you want, and you usually have to do little but power them and connect inputs and outputs as described by the data sheet. You will get so much farther, so much faster, once you accept that. Designing your own transistor amplifier is challenging, and you'll never match what the pros have already done for you.
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by Jake Hertz
by Jake Hertz