Practical Patient Respiratory Monitor: Traditional Chinese Circuit Des
In short: Traditional Chinese Practical Patient respiratory monitor. 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 5905 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
patient respiratory monitorThis device can be used to monitor the breathing conditions of critically ill patients. If the patient does not breathe for a predetermined time, an alarm will be issued to prompt medical staff to pay attention and provide timely rescue. It has the characteristics of simple circuit, stable performance and easy production. It is a kind of medical auxiliary electronic device.How it works:The working principle of the device circuit is shown in Figure 78-1. It is composed of a breathing sensor trigger circuit, a display circuit, a delay circuit and an alarm circuit. IC1 is a highly sensitive sound-controlled amplification drive circuit. As long as the sound intensity reaches 18dB or above, a signal can be output. The driving force of the respiratory airflow is greater than the density pressure generated by the sound in the air medium. Therefore, as long as the microphone BP senses the airflow, it can be converted into The electrical signal is amplified by the internal amplifier of IC1 and triggers the drive circuit to turn on after a slight delay. Therefore, the output pin 5 of IC1 changes from the original high level state to the low level state. The light emitting diode LED turns on and emits light. The human body keeps breathing and breathing, causing the LED to flash continuously. At the same time, the power supply also charges capacitor C3 through LED and R2, but when the ⑤ pin of IC1 becomes low level, the only trace charge in C3 is rapidly discharged through R2 and IC1's ⑤ pin. Therefore, as long as breathing is normal, the voltage across C3 is not enough to charge to turn on the transistor VT1, and it will not cause the action of the subsequent circuit. Of course, if the patient's breathing is very weak, or does not breathe for a long time, the ⑤ pin of IC1 will be cut off for a long time, the LED will go out, and the power supply will charge C3 through LED and R2, so that the voltage at the C3 …
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Lei Cheng
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Lei Cheng