Traditional Chinese Practical Expandable pager: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Practical Expandable pager. 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 2171 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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Expandable pagerIn the circuit shown in Figure 182, I, II...N are the same calling unit circuits, and the number of them can be increased at will according to the number of hospitals and guest (tourist) rooms.Figure 182The CD4051B in the figure is drawn in the form of a one-pole-eight-throw mechanical switch with similar functions. From the usage characteristics of CD4051, we know that its ⑨, 10, and 11 pins are used to control the "rotation" of its "knife" (③ pin): when no positive pulse is applied to these three feet, the "knife" stays on pin 13; when a positive pulse with an amplitude equal to the power supply voltage is applied to these three feet, the switch is turned on.In the figure, the light-emitting diodes LEDⅠ, LEDⅡ,... …

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