Development of Electromyograph Training Module for Education Purposes

Abstract

In recent years, a training module is an important feature for student biomedical engineering to identify bio signal or any signal in living cell that can be measured and monitored. Most biomedical training kit is compatible for education process but it is expensive, large in size and actual circuit cannot be seen by users. This project is discussing the Development of Electromyograph (EMG) Training Module for Education Purposes. Basically, this affordable EMG module is made for education purposes can be used by a medical student to measures and record the electrical activity of muscles either when these cells contract or when at rest. All three electrodes will collect all electrical activity in muscle which is Electrode 1 (E1), Electrode 2 (E2) and Reference Electrode (REF). The experiment is at the Biceps Bracchi for elbow flexion for 90° of forearm movement. Tested input waveforms are applied to the circuit which is 50mv for E1 and 100mv for E2 represent the muscle signal that will be placed between the biceps muscle while REF at the elbow. Then Instrumentation Amplifier amplified the input waveform with a gain value 61.6. Then the output from IA amplifier entering band pass filter to filtering, band pass filter consist of Low Pass Filter first stage Butterworth second order and High Pass Filter Sallen Key with a gain of 1 and cut off frequency 18.55Hz to 477.5Hz.Then, output from band pass filter enter Fullwave Rectifier circuit and divide into two as well as make all negative signals will be positive signal. The final output will display on the oscilloscope or LCD. Lastly, after doing a simulation and calculation the result will be compared with the practical. The inputs are from function generator which is E1 for 50mv and for E2 100mv as same as simulation. Then, the output for each of the circuit has been tested separately. The output for IA is 3.08v entering the filtering circuit where Vin is equal to Vout=3.08v and lastly entering the Fullwave Rectifier Vout is equal to 1.52v