Development of a Low Cost Elecromyogram (EMG) Circuit for EMG Tracking

Electromyography (EMG) is a technique used to evaluate and record the electrical activity produced by the human body's muscles. The electromyograph circuit can be used in various situations such as neurology, medical rehabilitation, and many more applications. The purpose of this work is the design and implementation of a low-cost electromyogram (EMG) circuit for EMG tracking with the enhancement of the acquired signal. The overall topology consists of four seven stages based on discrete operational and instrumentation amplifiers. The basic acquisition circuit consists of four stages for capturing the EMG signal, removing the interference noise, and amplifying the final processed signal. The rest of the topology makes a further signal enhancement by processing it with the exponential or the logarithmic functions, depending on the signal form. The output signal is suitable for direct driving a monitoring device or for acquisition by an analog-to-digital converter (ADC) for further digital analysis. The proposed circuit simplicity makes it suitable to be employed in a low-cost EMG system.