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Does anybody know how this op amp is working? And what the output signal is - avL, avR or avF. I don.t find similarities compared to a real ecg.enter image description here

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I don.t understand how this amplifier returns this particular waveform if we connect those 3 electrodes.

Does single-lead means that it records the signal from one electrode?

enter image description here

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    \$\begingroup\$ Your question is meaningless as asked. What is "this op amp" and why do you compare it to a "real ecg"? Do you have a particular circuit in mind? If so, provide a link so we can all share it. This is an electrical engineering exchange, not a psychic hotline. \$\endgroup\$ – WhatRoughBeast Oct 17 '17 at 20:57
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    \$\begingroup\$ Going to need a little more info from you, until then we'll put your question on hold. \$\endgroup\$ – Voltage Spike Oct 17 '17 at 21:00
  • \$\begingroup\$ I've connected the module to an arduino board only using the electrodes and the output pin - the standard way presented there. \$\endgroup\$ – tairebit Oct 17 '17 at 21:04
  • \$\begingroup\$ Presented where? Draw a schematic. \$\endgroup\$ – Peter Oct 17 '17 at 21:10
  • \$\begingroup\$ On the sparkfun website - learn.sparkfun.com/tutorials/… \$\endgroup\$ – tairebit Oct 17 '17 at 21:14
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Instrumentation amplifiers are used in order to amplify signals coming from particular part of body. They have differential amplifier inside. Diff. Amp. substracts the signals coming from inputs therefore it is very good at eliminating noise. Then the signal is processed by filters. This is how you get the signal in the picture, basically.

Please go ahead and make some research about amplifiers.

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