Traditional Chinese Thaw alarm: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Thaw 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 2106 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Thaw alarmIn order to monitor the climate or monitor the thawing situation of food, an instrument device for monitoring thawing is often needed.The circuit of this device is shown in Figure 6. The circuit is very simple. It only uses a 2-input four-NAND gate integrated circuit 4011, a transistor, a reed switch, a small permanent magnet, two 0.1μF capacitors, three resistors, and a speaker. These components can be installed in a very small box.The two NAND gates (1) and (2) in the 4011 form an ultra-low oscillator; its gates (3) and (4) form an audio oscillator, and its start-up is controlled by the output terminal (pin 3) of (1). The oscillator composed of gates (1) and (2) is controlled by the voltage applied to pin 6. …
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