Neil Mula


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  • Electromyogram for Medical and Health Purposes

  • Created: Aug 28, 2014

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This circuit design is for medical test equipment. It is made up of general purpose op-amps that have been incorporated to build an instrumentation amplifier. An instrumentation amplifier is suitable for test and measurement equipment like an electromyogram, which measures the electrical activity of muscles at rest and during contraction.

The general purpose op-amps (LM741) offers many features that make their functions reliable because of the overload protection on the input and output, with no latch-up when the common mode range is exceeded as well as freedom from oscillations. The input side uses an instrumentation amplifier for the amplification. The output side uses the ideal integrator amplifier configuration in which the circuit operates by passing a current that charges or discharges the capacitor over time causing the output voltage to drift until the op-amp saturates.

The combination of these two configurations of operational amplifiers are desirable for small signal amplification. It is an aid to the medical professionals for having equipment that could provide precise data about their patients or clients. Other than EMG, the circuit can also be used in electrooculography.



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