Traditional Chinese Rain alarm: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Rain 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 2619 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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rain alarmWhen clothes are drying outdoors and you are concentrating on a certain task or taking a nap, if the weather suddenly changes and it starts raining, it will be very unpleasant if you are not aware of it right away. Here is a small instrument to help you solve this trouble. As soon as it rains, it will sound an alarm to tell you that it is raining. Of course, the use of this instrument goes far beyond that. It can also be used as a baby bedwetting alarm, water level alarm, etc.Its circuit is shown in Figure 12. Its main components are also a 4011 integrated circuit, an NPN transistor and a speaker.All four NAND gates of 4011 are used. Among them, NAND gates 1 and 2 are used as controllable ultra-low-frequency oscillators. When its pin 6 (an input end of NAND gate 1) is connected to low level, it will not oscillate. At this time, its pin 3 (the output of NAND gate 2) is low level. …

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