Traditional Chinese Blood transfusion electronic alarm: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Blood transfusion electronic alarm: Circuit Design, Parts List & Workshop Prototype Guide (Alarm Device). 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 2014 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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Blood transfusion electronic alarmWhen a hospital transfuses blood to a patient, accidents may occur if the blood is not handled promptly after the transfusion is completed. The application of electronic blood transfusion alarms can effectively avoid the above phenomena.The principle circuit is shown in Figure 185. It consists of a light source S, a blood flow glass tube B, a photoelectric conversion device VT1 (photosensitive transistor), an electronic switch composed of transistors VT2 and VT3, and an audible alarm part. …

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