integralx2
New Member
If i have coxial cable, connected to the human body through electrodes, is it picking up 50hz hums , or 60hz ? I will use a batter to supply the circuit
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
A instrumentation amplifier IC is used in ECG circuits. It has excellent rejection of common-mode voltages (60Hz plus DC). An opamp is used to produce a negative AC plus DC common-mode signal to the patient's right led to cancel mains hum and DC voltage fluctuations.
35 years ago school kids tried to make the circuit with individual opamps but few of the circuits worked. You are probably copying one that did not work.
A instrumentation amplifier IC is used in ECG circuits. It has excellent rejection of common-mode voltages (60Hz plus DC). An opamp is used to produce a negative AC plus DC common-mode signal to the patient's right led to cancel mains hum and DC voltage fluctuations.
35 years ago school kids tried to make the circuit with individual opamps but few of the circuits worked. You are probably copying one that did not work.
Maybe your lecturers don't know about new ICs and new circuits.
Or maybe they want you to see that a circuit made with old 741 opamps and ordinary resistors doesn't work and why the new Instrumentation Amplifier ICs were developed.
If i have coxial cable, connected to the human body through electrodes, is it picking up 50hz hums , or 60hz ? I will use a batter to supply the circuit