Traditional Chinese Electronic listening device: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Electronic listening 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 4992 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
electronic listening deviceThis device can be worn on the wrist of a deaf person and uses the mechanical vibration generated by the piezoelectric sensor to stimulate the sensitive skin of the wrist to achieve the purpose of "listening" to sounds.Circuit principle:The circuit schematic is shown in Figure 105. Microphone BL converts ambient sound into electrical signals, which are coupled to IC1-a through resistor R1 and capacitor C1 for amplification. Its output is divided into two channels through resistor R3: one channel is amplified by C2 to IC1-b, and its output is filtered by capacitor C5, and then divided by resistors R7 and R6 before being added to the inverting end of voltage comparator IC1-d; the other channel is amplified by capacitor C3 to IC1-c, and a reference potential is established on capacitor C6 through R8. This reference potential is added to the non-inverting terminal of voltage comparator IC1-d after passing through R10 and input resistor R9. If the voltage at the inverting terminal of the voltage comparator is higher than its non-inverting terminal, the voltage comparator outputs a low potential; if the voltage at its inverting terminal is lower than the voltage at its non-inverting terminal, the voltage comparator outputs a high potential.When the ambient sound increases, the potential applied to the inverting terminal of voltage comparator IC1-d is higher than the reference potential applied to its non-inverting terminal, then the reference potential of the non-inverting terminal of IC1-d decreases. …
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