Traditional Chinese Simple multi-purpose electronic stethoscope: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Simple multi-purpose electronic stethoscope: Circuit Design, Parts List & Workshop Prototype Guide. 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 2013 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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Simple multi-purpose electronic stethoscopeThe currently used air conduction stethoscopes are susceptible to interference and produce noise. Their sensitivity is also low and they can only be used by one person. The multi-purpose electronic stethoscope shown in Figure 35 is small in size and highly sensitive, and can be used by multiple people. When equipped with a recorder, the heart and lung sounds heard can be recorded for case discussion.In Figure 35, transistors VT1, VT2 and VT3 (3DG6) form a two-stage direct-coupled amplifier, and VT2 and VT3 are composite tubes. …

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