[Fred_fred2004]

 

---

 
Start with a very small electret mic insert 3mm is good



 
 
 
 
 
 
 

Bulk it up with a few layers of good old heat shrink



 
 
 
 
 
 
 
Put on a final layer this time insulate the mic body



 
 
 
 
 
 
    
Thank goodness for helping hands



 
 
 
 
 
 
      
Finally install into the head unit





 
 
 
 
 
     
  Meet Stethy
 
 
 
 
 
 
 
 The guts
 
 
The circuit is a dual opamp low gain, using the second stage as a low pass filter, the signal is then amplified by an lm386
a second LC filter on the output allows the user to focus on breath or heart sounds
Made for a family friend who was battling to pass a medical course with a hearing impairement,
this was the first time they were able to correctly hear a heart murmur.
Anyway just sharing, and more than a little chuffed it was harder than it looks to get it right
 
 
 
cheers
FRED
 

 
 
 
 
 
 
 
 

 

[Beftus]

Nice one Fred!

 

[qusp]

great work mate, now you need to pimp it out with cryo connectors and a custom molded earpiece no seriously thats a realy nice thing you did there and there are congratulations in order

 

[weibby]

haha imagine a doctor with this.

 

[elliot42]

Now that is unique, I've never seen anything like it before. Great looking, too.

 

[spookygonk]

Wow, I didn't know where the photos were going to lead to, but that's awesome!

 

[Fred_fred2004]

Thanks guys, its nice to do some thing different and the young lady will be a doctor next year so if you ever see it in real life you'll know were it came from

 

[the_equalizer]

That was a great thing you did there... as well as a very clean and professional technical job. Congratulations!  I bet the soon-to-be-doctor was very deeply thrilled.
 

 

[9pintube]

DOCTOR LARRY! DOCTOR CURLY! DOCTOR MOE!      great job, Fred

 

[racer_x124]

I like that I had no idea what that was at the beginning, and then didn't know what it was at the end either. It's a stethoscope right?
 
Cool build man.

 

[Fred_fred2004]

Yes its a stethoscope but its nick name is "Stethy" - because medical students need to call things silly names

 

[dbfreak]

Nice idea but useless in the field without FDA/MDD certification.

 

[TimmyMac]

Incredible.  Serious props, that's awesome.

 

[mrtndoog]

Thats really clever and very usefull,
 
and you don't need any approvals as a leaning tool,  you just fail the exams if you get it wrong not kill anyone

 

 

[Ntropic]

I'd certify it based on Awesome. FDA will see that bitchin' sweet sleeving and approve that all over the place. And don't forget that (what appears to be) 2200uF Nichicon KZ.
 
Quote:

Nice idea but useless in the field without FDA/MDD certification.