I did a little checking for you.
I held a microphone up to the belly of a Monk Parakeet (aka Quaker
Parrot),(aka Henry). This was to see how loud these little guys
hearts are and at what frequency. Henry did not mind as he enjoys
playing under towels. I noted most of the heart sounds to be between
150 cycles and 800 cycles. It also was seen as loud enough for a
standard microphone capsule. If you want to build a probe into the
nest from below and mount the mic cable to the bottom of the tree for
connections whenever you want it can be done with standard
components. Sample rate does not need to be greater than 2,000 bps
mono. I would recommend that you use a mic capsule from hearing aids
as they are about .1 inch. Then the problem becomes how to
waterproof the capsule. Plastic wrap should still work fine without
loss of to much gain.
To listen to Henry's heart download the small 64kb file at:
http://home.comcast.net/~richpeet/henryheart.wav
To check into hearing aid mic capsules go to:
http://www.knowleselectronics.com
Good luck, and post us some sounds when you get them.
Rich Peet
--- In Yuri Vladimir Albores
Barajas <> wrote:
> Hi everybody,
> It's interesting to find a group of people with this
> interests. I joined this group because I have to do
> something related with this, and thought could get a
> couple of advices from you people.
> The thing is this: I am starting my PhD project and I
> want to measure stress in birds, using non-invasive
> techniques. I would like to use a very sensitive
> microphone to measure changes in heart rate. I want to
> put these microphones within the nests just befre they
> lay eggs, so this has to be small too. I also need a
> kind of recorder or data logger, so I can analyse the
> data afterwards.
> I've seen some webpages, but have no idea about what
> to look for. Any suggestions?
> Thank you all
> Cheers
> Yuri
>
> P.S. apologies for any grammatical mistakes, English
> is not my first language
>
> _________________________________________________________
> Do You Yahoo!?
> La mejor conexi=F3n a internet y 25MB extra a tu correo por $100 al
mes. http://net.yahoo.com.mx
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