Traditional Chinese Practical Deaf hearing aids: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Practical Deaf 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 1858 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.

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hearing aids for deafnessHow it works:The working principle is shown in Figure 113. The weak signal from the microphone is input to the base of the low-noise tube VT by the coupling capacitor C2, so that the voltage parallel negative feedback amplifier composed of VT is pre-amplified, and sent to the ③ pin of the integrated circuit IC through the coupling capacitor C3 for power amplification. Its ⑤ pin can obtain an acoustic gain of 35 to 60dB, and the coupling capacitor C8 drives the earphone to produce sound.Among them, C2 and C3 use ceramic chip capacitors with smaller capacities. …

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