Traditional Chinese Practical Locked Precipitator: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Practical Locked Precipitator. 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 2042 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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Answering device with locking functionThe circuit schematic diagram is shown in Figure 137. There are 8 answering buttons (SB0~SB7). The CE of 74LS373 is grounded to turn on the three-state gate, and its output is connected to SN7406 and CD4072 respectively. The output of the CD4072 is connected to the 74LS32.Since the ① pin of NAND gate CD4011 is connected to high level, the G terminal of 74LS373 is controlled by the output of 74LS32. When no key is pressed, the output of the 74LS2 is low. After CD4011, the G terminal is high level, and the output of 74LS373 is the same as the input of the latch (1D~8D). At this time, the output of SN7406 is high level, and the LEDs of all gears are off. …

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