scorpio Posted September 15, 2006 Report Share Posted September 15, 2006 Hi, I am building my amplifier circuit for ecg and examining it by using an oscilloscope. The circuit consists of instrumentation amplifier(gain = 10), high pass filter(0.5Hz, gain = 3)and low pass filter(150 Hz, gain = 35). The voltage is regulated at 5V. Without feeding any input to the amplifier, I get the square wave(or attenuated sine wave) with frequency 50Hz and peak-peak voltage = 8V on oscilloscope. Is it really due to the power line interference and why the noise has such a large amplitude?? Will it affect my ecg signal?? and how to eliminate it? Thank you for reading my post and hope that you can clear my doubt. Quote Link to comment Share on other sites More sharing options...
Bain Posted September 16, 2006 Report Share Posted September 16, 2006 http://www.biomedical-engineering-onlin ... ent/4/1/50 Quote Link to comment Share on other sites More sharing options...
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