The actual processing in [birdyberth’s] circuit is easy to follow. The signal from the instrumentation amplifier is sent through a low pass filter, through a 741 op amp, and then on to the Arduino.

Posted in Medical Hacks Tagged ecg, electrocardiogram, electrocardiography, heart, instrumentation amp, instrumentation amplifier ← DIY I2C Devices With ATtiny85 ...

There are four amplifiers in the device: A custom instrumentation amplifier specifically designed to amplify ECG signals. Unlike traditional in amps, high pass filtering is built into the in amp’s ...

The downward trend ofsupply voltages in ECG circuits and thepresence of this larger half-cell potentiallimit the gain that can be applied in thefirst stage of signal conditioning. Figure 2 The AD8607 ...

The circuit in Fig. 2 shows an implementation of the negative-rail current-sensing block. It uses an instrumentation amplifier like the MAX4460 or MAX4208 and some discrete components.