TriGeminal
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Posts posted by TriGeminal
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It's doesn't give any light (maybe hardly I can see it!)
Does the LED oscillate slowly like the sound?
yes, R12 instead of 330k I put 270k because I lost my 330k .. also I connect solid single wires with standard several fine wires ones :)Did you substitute any parts?
They're the same I used the first time, but I didn't measure the voltage :)Are the 9V batteries fairly new? What voltage are they while the circuit is powered? -
After a while I decided reloaded the project again, I still use the breadboard but just re-connected the wires and get longer wires with clips for the batteries and speakers ..
I connect it to the audio card in my computer and I get this noise all the time (even if I removed the entire mic!)
Is it receiving signals from air or something? :)
Thank you -
Thank you steven :)
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Thank you SM2GXN :)
It seems cool 8) -
what is the simplest circuit attached to a MIC?
Cause I'd like to attache the circuit to my sound card an make amplifications with the computer ;D
Thank you :) -
Thank you MP, much appreciated :)
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I just bought a solder, which I guess had a large percent of lead .. even lead free solders can be more dangerous than solders that have lead!
What kind of solder do you use, must be some old extreme stuff.
I used another type, which had low amount of lead .. it was better, but same case, I had a weak respiratory system for days ..
When I was 6 years old I was used to use that type of solders and never had a problem, so I guess it's the place I solder .. it's not highly ventilated :)
Anyway, I'll be making a subdomain for that stethoscope, with shots and videos of every step in addition of medical hazards (cause we are medical students :D) .. -
I soldered the circuit on a veroboard .. it didn't work (cause bad joints mainly) .. anyway I'm not going to solder anything again after I was ill for 2 weeks cause of the toxic fumes :(
I'll try again with the breadboard circuit ... but I'm thinking to simplify the circuit .. I mean I'd like to give my computer a chance in amplification, so I'd like to know what is the simplest circuit attached to the MIC that makes sounds reach my computer?
I can use many programs to amplify the sound, just a matter of time :) -
My clear Heart sound ;D
I got a semi-shielded mic + pluged the audio jack into my computer .. then recored by jetaudio program ..
The air noise (some bad noise like air noise) are still mysterious!! I think I've a problem in something at the breadboard, that's why I'm soldering another one :)
Those noise can be heard even without connecting a mic! -
yes, that's exactly the circuit :)
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Thank you Audioguru,
Here's a link for Quicktime alternative to play video files (.3pg)
I'll solder the parts and apply a shield, I think it might bring better results :) -
My friend could assemble the exact circuit at this link:
http://www.electronics-lab.com/projects/science/019/index.html
Here's it on the breadboard:
Here's the sound "Puffing":
See the Video
The heart sound was very strange:
Here's an mp3 amplified file
Changes in that circuit, I didn't find 3.9 Ohm, so I replaced it with 4.7 and I've not applied a shielded cable yet :)
Was the 1st link about the circuit in this site working, or there was another one? ;D
Thanks everyone, specially Audioguru 8)
Electronic Stethoscope
in Projects Q/A
Posted
Sorry, belated :)
I measured the batteries .. one was 8.4v and the other was 7.2v! I think that difference might be counted :)