Traditional Chinese Practical TB505 Hearing Aid: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Practical TB505 Hearing Aid. 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 1789 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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TB505 hearing aidFigure 103-1 shows the internal circuit of TB505, and Figure 103-2 shows the application circuit. The circuit is equipped with a low-noise, low-drift, high-stability, self-compensated high-gain operational amplifier. An ultra-high β-value triode is connected to the output end of the operational amplifier to improve the circuit's voltage-reducing characteristics, …

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