Hello guys! I am trying to build a circuit for an electronic stethoscope.
I am using an electret microphone to capture heart and lung sounds(20-1kHz). As far as I know, electret microphone has integrated preamp.
So my question is, would I be needing an external biasing and pre amplifying before filtering the signal?? (i'm using 2nd order butterworth filter)
If yes please suggest an appropriate preamplifier. I am considering of using LM741 or LM358AD for the preamplification, if needed. I'm confused as to how to proceed with it since I need to make the stethoscope as light as possible.
Thank you!
I am using an electret microphone to capture heart and lung sounds(20-1kHz). As far as I know, electret microphone has integrated preamp.
So my question is, would I be needing an external biasing and pre amplifying before filtering the signal?? (i'm using 2nd order butterworth filter)
If yes please suggest an appropriate preamplifier. I am considering of using LM741 or LM358AD for the preamplification, if needed. I'm confused as to how to proceed with it since I need to make the stethoscope as light as possible.
Thank you!
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