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Home › Magazines › 2000 › December › ECG Amplifier

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ECG Amplifier

Published in issue 294, December 2000

This circuit allows an ECG signal to be displayed on an oscilloscope. Opamps IC1a, b and d form an instrumentation amplifier with a gain of 201. IC1c amplifies the common-mode signal by a factor of 31, and supplies this signal to the right leg. The first consequence of this is that the body is brought to a defined common-mode level, so that the signal will not lie outside the range of the instrumentation amplifier.

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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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