Traditional Chinese Practical Foreign Language Automatic Reader: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Foreign Language Automatic Reader: Circuit Design, Parts List & Workshop Prototype Guide. 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 2309 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Foreign language automatic readerIn the process of following the foreign language tape reading, one sentence is often not finished and the next sentence has already begun. For this purpose, a small circuit was made and installed in the recorder. It can automatically stop after each sentence of the tape. After a duration equal to that of the sentence just finished, it automatically turns on again and plays another sentence. During this period, students or teachers do not have to press the pause button frequently to distract themselves from learning. The circuit diagram is shown in Figure 147.Figure 147Circuit working principle:The audio signal passes through VT1 (9014), amplifies C2, VD1, VD2 and C3 and doubles the voltage, rectifies and filters it into a DC control voltage. …
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