Traditional Chinese Practical ECG Motion Recorder: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical ECG Motion Recorder. 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 2744 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
ECG dynamic recorderThis recorder is small in size, low in power consumption, safe and reliable, and easy to operate. It is not limited by time or location, and has the advantages of recording information and not losing it.The circuit schematic is shown in Figure 15. YYH40 is a dual in-line 28-pin integrated circuit. This circuit was originally used for "unattended duty calls" and "solid-state recorders" and has relatively complete functions. Since it is used for language processing, the sampling frequency of this circuit is high. According to the circuit diagram provided, to obtain a recording and playback time of 40 seconds, C1, C2 and L should be 470pF and 100μH respectively. The highest frequency of the ECG signal is less than 100Hz, so the sampling frequency does not need to be very high. In order to obtain the longest possible recording and playback time, in the design, C1 and C2 are set to 1000pF, and L is set to 200μH. …
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Lei Cheng
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