OPA335: opa335

Hi Juzer,

How do you interface the transducer with stethoscope's chest piece? This design should be similar to audio amplifier, except you may only need audio range from 20-2000Hz, instead of typical 20-20000Hz audio range.  

Enclosed are some of application notes we have for amplifier and low pass filter. 

https://www.ti.com/lit/an/sloa049b/sloa049b.pdf?ts=1592487383693&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fdocs%252Funiversalsearch.tsp%253FsearchTerm%253Dlow%2Bpass%2Bfilter%2Bdesign

https://www.ti.com/tool/LOWPASSFILTER-CALC?keyMatch=LOW%20PASS%20FILTER%20DESIGN&tisearch=Search-EN-everything

https://www.ti.com/tool/ANALOGPRGBK?keyMatch=ENGINEER%20DESIGN%20POCKET&tisearch=Search-EN-everything

https://www.ti.com/tool/ANALOG-ENGINEER-CALC?keyMatch=ENGINEER%20DESIGN%20POCKET&tisearch=Search-EN-everything

Please take a look at these links. If you need further assistant, please let us know.

Best,

Raymond

Hi Juzer,

what is "digital" in your "digital stethoscope"? What type of microphone do you want to use?

Kai

Hi Raymond and Kai

Thanks for your kind reply and Thank you so much for the links Raymond.

I am planning to used Contact Microphones but is it not available for purchase so i need to research and but if you can refer me one will be great help OR at-least guide me in selecting microphone as I am new to this.

Hi Juzer,

enter "contact microphone stethoscope" into the input box of search machine and you will found a huge amount of useful information.

What sound do you want to pick up with your stethoscope? And what is digital in it?

Kai

HI kai,

I want to pick and record human breath sounds and heart tones.

The word digital was included because the analog sound is converted into digital signal and processed to get the information displayed and stored on device.

I have read Digital Stethoscope Implementation (sprab38a.pdf) article of TI which gave me the motivation to build one. So I am researching on it to build my first prototype.

You are welcome :-)

Kai