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Do you find that only happens when they talk to you. LOLI notice lately that when speaking, many women end each sentence with a growl sound like their voice has quit working. They did not speak like that in "the good old days".
I can't believe the headphones are right across the power supply.The hearing aid circuit in post #9 has many mistakes. It is extremely distorted and is much too sensitive. The dual opamp selected should NEVER be used for an audio preamp because it is too noisy and also produces crossover distortion. Look here:
I like it when a woman whispers in my ear, "Come and get it". OOps, that is Selena Gomez's song:Do you find that only happens when they talk to you. LOL
The description of how the first circuit works is completely wrong (it says the 6.8k resistor between the collector and emitter of the BC557 when it should say between the base and emitter) which makes it confusing. Its gain of only 50 is too low for a hearing aid. Where can anyone find an earphone that is 8 ohms today because they are 32 ohms now.Here are some options with 'how it works' explained. Even a constant volume version!
**broken link removed**