Hello there.
I'm researching for making a small and mobile digital sthetoscope, I'm doing a few tests with an omnidirectional electret microphone inside a traditional stethoscope but the audio quality is not good enough.
I've designed 2 amplifier stages with x3 and x23 gain and a 4th order Rauch band-pass filter but I still have a lot of sorrounding sounds.
I think a unidirectional microphone or a contact microphone will improve a lot.
I would be very grateful for any help.
