Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/157267
Title: Design of a transducer-based amplifier system similar to an electronic stethoscope
Authors: Lim, Ivan Shi Cheng
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Publisher: Nanyang Technological University
Source: Lim, I. S. C. (2022). Design of a transducer-based amplifier system similar to an electronic stethoscope. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/157267
Project: A2199-211
Abstract: An electronic stethoscope is used to listen to the sound in a human body such as the heart or lungs. In this project, the electronic stethoscope is powered by a 2 AA battery. The electronic stethoscope consists of a microphone, pre-amplification circuit, filter circuit, power amplifier circuit as well as a LED comparator circuit. When the electret, condenser microphone is being biased by the battery, the output impedance is 2,200 ohms. The condenser microphone picks up the input signal, which is the heartbeat. It is then fed to the pre-amplifier circuit as the heartbeat is too small to be seen in the oscilloscope. The pre-amplifier circuit helps to amplify the heartbeat. However, it also amplified the environmental noise which is then filtered off by the filter circuit. This filtered signal is amplified by a variable volume control circuit to drive a speaker that is audible to the user. The electronic stethoscope also has a visual effect as it uses light emitting diodes to output the magnitude of the input signal after amplification.
URI: https://hdl.handle.net/10356/157267
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:EEE Student Reports (FYP/IA/PA/PI)

Files in This Item:
File Description SizeFormat 
U1921003C_LimShiChengIvan_FinalReport.pdf
  Restricted Access
4.44 MBAdobe PDFView/Open

Page view(s)

21
Updated on Jun 28, 2022

Download(s)

2
Updated on Jun 28, 2022

Google ScholarTM

Check

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.