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Heart Beat Pulse to Sound Converter Monitor Circuit

Last Updated on November 3, 2020 by Admin Leave a Comment

In this write-up we discuss a comprehensive circuit which allows the user to convert heart beat pulses into loud audible sound from a connected buzzer.

Thus , the design could be effectively utilized for listening to a patient's heart beats without depending on cumbersome stethoscopes or complex visual devices.

Introduction

Relying on the fact that blood supply pulsates at the frequency of the heartbeat, the circuit in the discussion is designed to determine the flow of blood through a finger.

Considering measuring errors like the position of the finger and inconsistent motion, the receiver diode is placed in a loop.

How the Circuit Works

Terminal 3 (positive input) of IC1 is maintained at around 2.5 V while the ratio R5: R4 decides the gain of the device. Furthermore, network R6 to D4 warrants the circuit is steadied quickly while IC2 rectifies the amplified signal.

To enable a sawtooth shape of the voltage at pin 2 of IC2, time constants R8 to C4 and R7 to C4 are chosen.

The trigger is activated by CA3130 in the IC3 position. You can feed the output signal to the input socket of a computer. Alternatively, you can hear the beat using a piezoelectric buzzer functioned by gates N1 and N2.

To let know the circuit has steadied and suitable for use, a WAIT signal is given by IC5.

The first programming step is to wait for a trailing edge before counting for the next trailing edge.

Afterwards, the counts are transformed into a certain number per minute and presented on the screen.

But the heartbeat rate can be inconsistent, and that may be apparent from hearing the buzzer or looking at the monitor screen.

So, it is recommended to calculate an average of 60 seconds before recording the rate.

Then, it is possible to present the immediate value, its 60-second average and if there is a rising or falling trend. 

When the program works correctly, the actual signal can be displayed clearly on the screen.

What is more, if an analogue-to-digital converter is used, the output signal of the IC1 may be directly utilized for the display.

Warning: The device should not be considered to be a medically approved heart beat monitor circuit. It may be used only for fun and casual experimentation

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About Admin

Hey friends, Thanks a bunch for stopping by this site! I am an engineer with a Bachelor of Engineering in Electronics and Telecommunication. One of my passions is gathering information from all sorts of electronics books and tutorials. I then take that information and compile it into a language that is super easy to understand. My goal is to make those complex electronics circuit concepts and technical terms much more accessible for all the new and budding electronics engineers out there. I can also design customized circuit diagrams as required by the users.
If you have any questions related to this field, please do not hesitate to drop a comment! I am always here and ready to help you out with any queries you might have. I cannot wait to hear from you!

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