The publish explores a straightforward circuit which can be employed for supervising the essential heart rate of a patient (senior citizen), the circuit furthermore consists of an alarm for showing the condition.
In the earlier article we picked up to create a heart rate sensor circuit with processor, which might be properly utilized in the offered important heart rate alarm circuit.
The application listed here is for reference design purposes only and is not meant for any life-saving or medical-monitoring use.
Talking about the diagrams above, you can easily observe a few circuit stages, the first being the heart rate sensor/processor with an built-in frequency multiplier, while the second by means of an integrator, comparator.
The upper signal processor design continues to be widely described in the prior submit, the further voltage multiplier that is certainly been incorporated to the processor utilizes the IC 4060 for boosting the comparatively less quickly heart rates into a consequently differing high frequency rate.
The above correspondingly changing high frequency heart pulse rate from pin7 of IC 4060 is given to the input of an integrator whose task is to transfer the digitally varying frequency into a equally varying exponential analogue signal.
Lastly this analogue voltage is placed on the non inverting input of a Ic 741 comparator. The comparator is set by means of the connected 10k preset such that the voltage level at pin3 remains just below the reference voltage at pin2 when the heart rate is in the vicinity of the secure region.
In spite of this if the heart rate is likely to boost over the crucial region, a correspondingly higher voltage level is produced at pin3 which exceeds the pin2 reference level triggering the output of the opamp to go high and sound the alarm.
The above set up only displays and alarms concerning the higher important heart rate, to be able to attain a two way checking, which means to get an alarm for both higher and lower crucial heart rates…the second circuit consisting the IC555 and IC741 might be completely removed and restored with a regular IC LM567 circuit set to maintain its output low at the protected pulse rate, and go high at the up or down critical rates.