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ECG circuit digram with AD620 and 741 op amp as a gain differentiator

mahlatse

May 18, 2015
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May 18, 2015
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hi, here is an ecg circuit which uses, an AD620 instrumentation amplifier and a 741 op amp. it has low pass and high pass filter and also a t-notch which eliminate 50hz noise at 80dB. my problem is i need to add a right leg drive so my signal can not disappear once i connect my right leg. but the problem is i dont know how. i vwould love to use a 741 op am for my right leg drive since i dont have enough time to buy new componets
 

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Laplace

Apr 4, 2010
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Can I assume that you just want to lower the impedance level of the ECG Signal? In that case use a 741 as a voltage follower (gain = +1) and connect the ECG Signal to the +input of the 741. The output of the 741 will be a replica of the ECG Signal at a lower impedance level.
 

dhruvit_bhimani

May 10, 2023
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May 10, 2023
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Can I assume that you just want to lower the impedance level of the ECG Signal? In that case use a 741 as a voltage follower (gain = +1) and connect the ECG Signal to the +input of the 741. The output of the 741 will be a replica of the ECG Signal at a lower impedance level.
Hey I want to make like this but I have only lm741 so should I replace it with ad620 or I have to use ad620 anyhow ?

And is this circuit give proper pqrst wave like big mashine does
 

Harald Kapp

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Nov 17, 2011
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A 741 will not work where the AD620 is required. For the input an instrumentation amplifier is needed and can't be replaced by a 741.
And is this circuit give proper pqrst wave like big mashine does
What do you mean by "pqrst"?
 

AnalogKid

Jun 10, 2015
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After 8 years, I don't think the OP is completely invested in a solution. In case anyone else is, here is one common way to do this.

ak

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