Traditional Chinese Practical Toddler Lift Notifier: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Toddler Lift Notifier. 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 2433 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Toddlers turn on the tellerFigure 210 uses CMOS NAND gate current to design and produce a quilt alarm, which can effectively relieve the "dream worries" of young couples.Figure 210Circuit principle:IC1 (μD4012) is a dual four-input NAND gate circuit, only half of which is used here. Pins ②, ③, ④, and ⑤ are the four input terminals, pin ① is the NAND input terminal, pin 14 and ⑦ are the positive and negative terminals of the power supply, and the rest are not used. IC2 is a music integrated circuit, which can be selected according to needs. KD-9300 is used here. The RPT terminal is the trigger terminal, and the OUT terminal is the output terminal. The signal is amplified by the 9013 and drives the speaker. C1 is used to prevent interference and false triggering. …
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