This project is very usefull for beginner who like to build an electrocardiograph. Building with simple circuit and displaying data on Computer by using soundcard. More Basic, Circuit, and Software. More

ECG Amplifier with AD620, by cs.wright.edu

Basic Practice on designing and building a non-inverting amplifier using an op-amp to amplify ECG waveform. Experiment on filtering the ECG waveform with a low-pass filter. More

EKG Amplifier Circuit , by John Nozum

Believe it or not, but the human body is full of electrical signals which can be picked up and analyze. These signals come from nerve impulses, which can cause muscle contractions. It is the varying VOLTAGES that are picked up and analyzed. These voltages are amplified greatly (typically by a factor of 1000 X on EKG and around 10,000 X for EEG). The output then can go to a video monitor, paper plotter, radio transmitter, and/or to an analog or digital recording system. More

The Isolation Mode Rejection Ratio in Bioelectric Amplifiers , by A. C. MettingVanRijn, A. Peper, C. A. Grimbergen..

Galvanic isolation of a patient during a bioelectric recording is necessary to ensure the safety of the patient. In a typical measurement situation high interference voltages may be present across the isolation barrier. In this study the necessity of a very high isolation mode rejection ratio - the ability of the amplifier to suppress feed-through from voltages across the isolation barrier to the output - is argued and a design of a multichannel amplifier with an isolation mode rejection ratio of 160 dB is described. More

HIGH QUALITY RECORDING OF BIOELECTRIC EVENTS. I: INTERFERENCE REDUCTION, THEORY AND PRACTICE, by A. C. MettingVanRijn, A. Peper, C. A. Grimbergen

In the first part of this paper the various mechanisms that could be the cause of interference in bioelectric recordings are reviewed. It is demonstrated that the performance of a good amplifier can be seriously degraded if, for its functioning, not the whole measurement situation is taken into account. Several techniques to reduce interference, guarding and driven right leg circuits being the most important, are analysed. More