Traditional Chinese Practical baby bed wetting alarm: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical baby bed wetting alarm. 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 3097 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Practical baby bedwetting alarmFigure 175 is a bed-wetting alarm with a delay circuit. It can wait until the baby has completely urinated before sounding an alarm. It can be used as an updated product for the baby urine alarm. Some babies have the habit of peeing intermittently. In this case, the delay time can be adjusted to more than a few minutes. Due to the use of a delay circuit, the baby's wet diapers can be changed in time while reducing the number of diaper changes, which is very beneficial to the baby's physical and mental health.Figure 175Normally, because the upper end of R1 is floating, VT1 is cut off, VT2 is turned on, the charges at both ends of C1 are short-circuited, VT3 is cut off, the IC does not work, and BL is silent. When the diaper is wet, due to the conductivity of urine, the moisture-sensitive probe XP is equivalent to a resistor of several thousand ohms, allowing VT1 to obtain bias current conduction. At this time, the collector of VT1, which is the base of VT2, drops to a low potential, thus turning off VT2. …
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