Design and Development of A Low-Cost Electromyogram Amplifier for General-Purpose Biosignal Amplification

Rekabentuk dan Pembangunan Penguat Elektromyogram Kos Rendah Bagi Amplifikasi Isyarat-bio Umum

  • Zinvi Fu, Ph.D. Politeknik Kuching Sarawak
  • Ahmad Yusairi Bani Hashim, Ph.D. Universiti Teknikal Malaysia Melaka
  • Zamberi Jamaludin, Ph.D. Universiti Teknikal Malaysia Melaka
  • Imran Syakir Mohamad Universiti Teknikal Malaysia Melaka


The electromyogram (EMG) is a biological signal which manifests during muscle contraction. It is widely used for health, biomechanics and machine control. However, high-performance EMG amplifiers are costly while self-developed solutions face reliability issues. In this paper, a low-cost solution to EMG amplification is introduced. The proposed design incorporates a front-end filter, a differential stage, and a bandpass filter. The resulting prototype consists of six differential inputs and is constructed into a compact housing. Being battery-powered, it is portable and safer as it is not powered by the mains. The developed device was rated to achieve a common-mode rejection ratio (CMRR) of over 90 DB with a high input impedance of 20 GΩ which is comparable to the commercial device. In addition, test results also showed that the baseline noise amplitude was similar with or without the right-leg drive.

How to Cite
FU, Zinvi et al. Design and Development of A Low-Cost Electromyogram Amplifier for General-Purpose Biosignal Amplification. Jurnal Sains Sosial dan Pendidikan Teknikal | Journal of Social Sciences and Technical Education (JoSSTEd), [S.l.], v. 4, n. 1, p. 113-126, june 2023. ISSN 2716-6740. Available at: <>. Date accessed: 26 july 2024.

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