Microphone Amplifier Speaker Hearing Aid Diagram. So it gets dc current by a battery through resistor r1 10k. A smart hearing aid.
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Condenser mic audio amplifier and loudspeaker. Audio amplifier circuit components required. A hearing aid circuit can be used for many purposes like listening fait sounds bird listening speech amplifier etc.
Which serves as a first audio.
The sound detection section employs a quad op amp ic lm324 ic1 a and a timer ne555 ic2. To make a hearing aid an audiologist or hearing aid dispenser will make an imprint of the patients ear by pouring silicon material into the ear. The figure below shows a very simple and easy to build hearing aid that can also be used for above describe purposes. It passes only ac to amplify into the base of transistor q1 bc547.