Build your own digital stethoscope!
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- Опубликовано: 8 сен 2024
- Teardown Lab - Build your own digital stethoscope!
Want to listen to your heart? Thats easy enough! Want to record your heart? Thats expensive without this DIY solution!
I would advise you take care when mixing computers, electricity and metal probes held over your heart. If it seems dangerous to you, then dont do it :)
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Thanks you lovely people, and keep on tinkering!
this method can save lives. a cheap electric sthetoscope will be easy to be used for remote hearing of covid pacients
Good point. I might start working on a v2
I tried to build one but the sound output is very low can you help me
That's good idea with adding some filters it will be more precise for remote patient monitoring..
I think ideally it would be best to add an amplification and fitting circuit to optimise the bandwidth of the audio hardware in the pc.
The disturbance you edited out is actually what we try to catch
Thanks
4 very important stethoscope cardio
Hi again!
Just to answer your question:
Yep, it's fine to wire L and R together for mono.
That's how all the skype mics etc. are wired!
I think a lot of the sound cards that mostly don't have stereo mic inputs are wired anyway.
Better to have both tip and sleve wired up, as if one is left hanging, it'll pick up humm.
Tip, Left, ring, Right, sleve gnd.
and I'll ignore the modern smart phone standards with the extra rings for video and stereo headphones etc!!!
Hey thats great! Thanks for getting back to me, glad its correct! My PC is actually putting out a bias voltage so is powering the mic just like the camera, I wonder if they all do that. Either way, does mean the mics need to be wired up with the correct polarity.
Yep, all PC mic inputs should do that.
If you need to make your own supply, it's just a 3v to 9v battery, a 10k resistor from bat Positive to the mic positive, and a cap from there to the audio in tip/ring.
Probably 22uf as you want the low frequencies to get through in this one!
just hook all the negatives and gnd s together!
The mic capsules have a fet inside, so are a resistance changeing device.
You might find that the higher bias voltage you put on there, the more amplitude/gane you'll get and more headroom before things clip.
I think most capsules can take up to about 9v before they pop!
Still, at $2 for about 10 of them on ebay, you can afford to bang a couple in the name of science!
The better quallity ones will give better sig to noise though!
You could adjust that 10k to get the positive of the capsule to about half your battery voltage for best performance!
+william Taylor This is great advice! I really like audio circuits, had to design a few amplifier and mixer circuits, it's interesting how the DC and AC components are invisible to each other 😁
Well, they can be separate!
That is unless you make fully DC coupled multi stage amps, so that if one thing go's wrong, the whole thing go's up in smoke!
Caps are always a gray area, electrolytics that leak which is the main cause of scratchy pots on most amplifiers, and reduced level or bass when they start to dry out!
and while I'm on caps.
No one in the electronic field seems to have figured out that electrolytic caps in switchmode supplies act like a battery with one of those desulphaters on it which is why they blote and ultimately die!
The oxide layers keep breaking up and re building themselves until you have a capacitor full of black oxide goo and hydrogen that eventually makes it blow it's top!
I'm sure a ceramic across it would prevent this...
End or wrant!!!
Still, in audio amps, they often last quite well, and I've got stuff from the 80s that still works fine!
@@backofficeshow yes and no, i would try it and see all ways , both ways , at least as a sounding board and feed back for trouble shooting purposes that is how ever,
The lub dub sounds are the sounds of the valves closing
Fantastic, that sounds like a Rick and Morty quote 😂
@@backofficeshow wubba lubba dub dub
Can you tell me the specific name of the microphone you used please?
This + wireless buds would help medical workers do physical exam to covid19 patients while wearing hazmat suit
That's a pretty neat idea 😂
Hi! I'm trying to make this but want to connect the electret to an XLR cord instead so I can live project the sound through my mixer for performance purposes. Do you (or anyone out there!) think this would work? Any ideas for how to connect the condenser mic to an xlr cord?
There must be a way to BOOST the microphone, I bought a simple microphone amplifier from the dollar store it takes 2 AAA batteries. It is very loud and only used boosting an ebay micorphone amp that I use for listening to and detecting emf noise from light bubs house wiring, computer key boards.... To make a mic to listen to these energies use the same mic design you have in the video just cut off the outer tin and leave only the disc the wires are soldered to and bingo, after that put it next to your key board and listen to the noise your hands are contact with with you type...
I have created a DIY electronic stethoscope using the chest piece and connecting it to condenser mic over the tube. While I am able to hear all outside sound , I am not able to hear any body sound at all (heart/lungs) . The same chest piece when connected to tube of stethoscope works well . I am using audacity software for recording. I would appreciate any suggestions for resolving this . Thanks
Soumitra Bhattacharyya hmm. I'm not really sure, I had a few different mics, might be worth trying a few alternatives. I suspect they need to be able to react to the right frequencies
what is the diameter of the microphone you used? would this be a standard size or does the inner diameter of the tube very depending on the stethoscope you buy?
I believe the microphone I used was around 6mm. As the tube is quite stretchy you can make it fit. I think the inner diameter of the the was around 3-4mm I do not think it is that critical
thank you
Using the stethoscope only for noises to me is useless. I am not a doctor!!! I need it to detect noises, voices from various materials such as wood, metal, brick masonry, glass, etc. For example in a house I would like to apply a very ordinary FM radio in one room and then in 'another room try to detect what the chosen broadcaster is broadcasting. Do you understand what I need? I look forward to hearing from you. Greetings.
Which version of audacity is this?
Hey, how were you able to connect the digital stethoscope to Audacity? I'm having trouble detecting the microphone.
Have a look at the various inputs and gain controls in Windows mixer
At 12:40 the machine you used to solder the wires to the microphone, is there any alternative to that and also why was the white wire not attached as well. Thank you
Not really, unless the microphone has wires you can twist and tape
@@backofficeshow Sounds good, also do you think a hair dryer would be able to replace the heat gun or probably not
Hair dryer max temp = 80 degrees centigrade (at a guess), Hot air station = 500 degrees centigrade. I think you will be waiting a long time for solder to melt 😁
Hi sir. I have some question, can i ask to you?
Can we connect it to Bluetooth headset
Hey man I was wondering if a condenser microphone would work with this circuit thanks
Also, after the microphone was connected to the headphone jack, was the headphone jack simply connected to the computer and recorded?.
Yes
Yes, as long as the polarity is correct for the mic
@@backofficeshow ah ah thx man appreciate it
Is this too cheap of a stethoscope or do you think it'll work
Hi sir , you've done a great job. I'm also doing a project on stethoscope actually I can't define my project here cause it's not done yet, I saw your project video and it's quite interesting and resembling my project in some areas so it'll be quite helpful if you reply and discuss my project in detail. your precious time will be very much appreciated. thank you
Aoa, what was your project brother? I have also made one like this
@@irfanilyas9335 my apologies for late reply. it was a smart stethoscope , also combining ecg with stethoscope for covid patients
Medical topic again, nice. Is it kind of your field of work? Nice fake Littmann stetoscope though, The real ones are quite expensive.
+Marcel Ooms I don't really have any particular field I just like to learn things, but I an engineer at heart so I guess I like to see analogues between the human body and machines 😁
Hey there!! I'm really interested in this. Tried it out in a basic Bluetooth potable speaker, but it turns out it has no phantom power, could you please explain to me how to add phantom power? with battery would it need? How to wired it? Thank you very much!!!
Did you try to measure any voltage across the microphone wires?
Good video but please use a more relaxed background I get freaking stressed out
which type of microphone is this
Electret
which microphone you used. normal or any other.
A Regular condenser microphone. It gets it power from the PC or Camera for its internal amp.
can you please told me the model number of the microphone .i am from bangladesh
Hi,
I was trying to create this device but after a few attemps it doesn't work, I checked that there is phantom power and there is.
After connecting the device to the phone and computers but it doesn't work.(the computer and phone still using the built in microphne.
Can you help?
Thank you in advance
Correct polarity?
Would this work?
imgur.com/a/npSuU
If so, patent pending.
This will work with a 100% success rate! Well done :)
A little bit, I am glad it as it was interesting seeing all the comments and interacting. I think it was traffic from Reddit, people are passionate about their CPUs!