Traditional Chinese Practical ECG FM Demodulator: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Practical ECG FM Demodulator. 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 1642 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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EKG FM DemodulatorFigure 13-1 shows the use of artificial satellites to forward electrocardiograms and other blocks with a bandwidth of 0.5 to 50Hz. It consists of phase-locked loop, differential amplifier, active low-pass filter and level converter. alt="17.jpg (16119 bytes)">Figure 13-1The electrical schematic diagram of the electrocardiogram FM demodulator is shown in Figure 13-2. The audio signal acts as a frequency modulation signal on a 1kHz voltage-controlled oscillator (in a phase-locked loop composed of IC1). The oscillator frequency deviation is ±40% when the input reaches the maximum. …

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