"Mike" wrote in message
...
In article ,
David Farber wrote:
a sensitive stethoscope. Each left and right mic contains two small mics
that
face each other.

The shield stuff is probably just foam to keep wind and dust out of the
mics. This won't make the mics more sensitive in the way you describe --
it's absence will make wind noise more objectionable. Try and find a
suitable foam replacement. Codge something together from a standard foam
mic-protector if necessary.

If your mics really are *each* made of 2 small mics facing each other,
that
is, 4 mics total ... it sounds like they are being used to do noise
cancellation or directional control of the sound (like a wide-tele zoom
setting). The original positioning and wiring of the mics would be
important. It is possible to create cardiod/hyper cardiod patterns by
sticking 2 capsules back to back and then "mixing" the resultant signal.

[If you've ever seen studio mics with the omni/fig 8/cardiod switches,
that's
one way they achieve it]

Did you wire the new capsules in *exactly* the same, and are you sure? The
wiring of the old ones may have been counter-intuitive, and you've
accidentally wired the new ones "intuitively", if you get me.

Did you get them in the right physical locations?

There are two ways to install the mic pairs. That would be either facing
toward each other or facing away from each other. I installed them facing
away from each other because it made more sense to have them facing the wind
screen where the sound would presumably be entering.


Have you mixed and matched old capsules and new, or replaced wholesale?

Have you still got the old capsules?

The picture at the link below shows the new capsules and they are identical
to the old capsules.

Any details on how the mics are wired (series, parallel, their own
separate

Each pair has its own four pin plug. The pc board wiring connects the two
mics in parallel. The net result is that you have two left mic's, two right
mic's, and each left/right pair in parallel.

inputs etc.) ?

Mike.
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Mike Brown: mjb[at]pootle.demon.co.uk | http://www.pootle.demon.co.uk/

The new mic's come prewired with connectors that match the PC board
connectors. Each microphone pair is in a metal casing which itself is
encased in a rubber fitting. Here is a link to the picture.
http://www.pbase.com/image/39324113/original

Thanks for your reply.