Traditional Chinese Practical Auditory Voltmeter: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Auditory Voltmeter. 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 2616 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
auditory voltmeterFigure 119 is the principle circuit diagram of an auditory voltmeter. The voltage-controlled audio oscillator in the figure can change with the control voltage in the 2-octave frequency range from 400Hz to 1600Hz: 400Hz at 0V, and 1600Hz at the maximum voltage, which is the full-scale voltage.In the figure, the voltage divider composed of a total of 10 resistors R12 ~ R21 and R11 produces a relatively accurate reference voltage, which can correspondingly produce 11 reference tones, which is equivalent to 10 scales from 0 to 10 on the voltmeter scale. Each resistance value should be accurate, calibrated, and correspond to the measurement range of 0 to 100mV. The voltmeter has eleven scales of 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100mV. …
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