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APPLICATION CIRCUITS Medical ECG Applications Figure 9 shows the INA321 configured to serve as a low-cost ECG amplifier, suitable for moderate accuracy heart-rate applications such as fitness equipment. The input signals are obtained from the left and right arms of the patient. The common-mode voltage is set by two 2MΩ resistors. This potential, through a buffer, provides an optional right leg drive. Filtering can be modified to suit application needs by changing the capacitor value of the output filter.
