Vol.11, No.1, February 2022.                                                                                                                                                                           ISSN: 2217-8309

                                                                                                                                                                                                                        eISSN: 2217-8333


TEM Journal



Association for Information Communication Technology Education and Science

Study of Amplifier Operating Point to Improve Phonocardiogram Signal Representation in a Custom-made Electronic Stethoscope


Juli Astono, Heru Kuswanto, Sumarna Sumarna, Wipsar Sunu Brams Dwandaru


© 2022 Wipsar Sunu Brams Dwandaru, published by UIKTEN. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. (CC BY-NC-ND 4.0)


Citation Information: TEM Journal. Volume 11, Issue 1, Pages 174-178, ISSN 2217-8309, DOI: 10.18421/TEM111-21, February 2022.


Received: 04 September 2021.

Revised:   20 January 2022.
Accepted: 26 January 2022.
Published: 28 February 2022.




The performance of a custom-made electronic stethoscope needs to be improved through a study on the operating point of the amplifier. The aim of this study is to analyse the composition and content of the frequency components contained in the phonocardiogram signal by spectral extraction. The output is a voltage signal that represents the heart rate. The operating point of the amplifier is varied. The signal is recorded on a laptop and analysed. The results show that the operating point produces a balanced swing signal. Hence, the amplifier’s operating point does not affect the component spectrum in the recorded signal.


Keywords – amplifier’s operating point, phonocardiogram signal, custom-made electronic stethoscope.



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