Welcome to AAC.currently i am trying to use microphone of my headset to record but its not efficient so any other approach is fine
You missed this:AG is correct! and experimentor electronic stethoscopes have been published back when they used tubes for the amplification. An electret microphone is OK, but a crystal microphone was claimed to produce the better results,probably because of a much larger diaphram area. So certainly it can be done using almost any generation of technology, although batteries and tubes is not a good choice. Probably the headset microphone is the least satisfactory choice.
One interesting possibility would be to use an actual stethoscope and connect the ear tube to an electret microphone, since those are available with quite small diameters. You still need a bit of gain, although running the electret directly to the computer microphoneinput should produce some results.
https://journals.physiology.org/doi/full/10.1152/advan.00073.2012 is how I would have expected it to be done. The article seems to provide enough information to do what you want in terms of the microphone.
I certainly DID miss it. My contribution is that the cartridges are also available from places like Digikey. But if an old computer headset is available for salvage then the really hard part will be the soldering the lead to the cartridge. Many folks are unable to do that at all.You missed this:
thanks for this though could you let me know what switch you are talking about? it would be great help if you can provide me some links.My Electronic Stethoscope uses a cheap electret microphone mounted in a hole of a plastic lid from a jar. It is amplified with an opamp circuit that has a good response at low frequencies. A switch with high frequency filter is used for cutting higher frequency noises or for receiving breathing sounds. A speaker and power amplifier can be used only to play back a recording to avoid acoustical feedback howling.
While the performance may be adequate, that listed price of $169 each is totally out of line. Also note that the specifications listed are not to be trusted, as they claim the operating current is 24 amps! If that number is so very far off then I suggest that none of the claims should be trusted.i am attaching a microphone i found online could you let me know if this is a wise choice for the project
i think you got the price wrong its 169 indian rupees means 2.2 dollars though i am not quite sure about specs but its cheap so it might be worth a try? , thinklab one is 499 dollars which is why we are trying to make a affordable one.While the performance may be adequate, that listed price of $169 each is totally out of line. Also note that the specifications listed are not to be trusted, as they claim the operating current is 24 amps! If that number is so very far off then I suggest that none of the claims should be trusted.
Given that the "Thinklabs" site does not even mention a price, my guess is that it is quite high also.
So now one question that applies to any electronic stethoscope: Do you have a qualified person who can compare the results they hear with it to the results that they hear with an actual medical grade stethoscope? The proof of any device will be in the performance.
Aside from that, both the "Free Information Society" website and the "Schematics for free" website had electronic stethoscopes in their list of circuits available for downloading. At least they used to have them.
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