Traditional Chinese Practical Hearing aids: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Hearing aids. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 3603 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Hearing aids with frequency selection functionHearing aids are mainly miniature amplifiers composed of three parts: a miniature pickup (microphone), an amplifier and headphones. Although the circuit structure of hearing aids is similar in form to that of general amplifiers, their requirements are different. Amplifiers are designed according to the hearing range and range of normal people, while hearing aids are designed according to the characteristics and degree of aphonia in deaf patients. Although the requirements for frequency response, harmonic distortion, noise, etc. of general hearing aids are not as high as those of amplifiers, and the number of amplifier stages is less than that of amplifiers, they have certain requirements for relevant performance indicators. Usually, the sound transmission gain of hearing aids should be around 15 to 55dB, the frequency response should be between 100 and 600Hz, …
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