Actually, after Sampo's hint, everything does indeed work fine (without
the 10x gain of the power-supply/conditioner, I might add).
Cheers,
DS
Asbjørn Sæbø wrote:
On Sat, May 13, 2006 at 08:03:48AM +1000, D. Sen wrote:
Yes, sure.
Here are the relevant links for the 4189 + 2671 microphone housing in
our setup, that connects to the Deltatron power supply.
http://www.bksv.com/pdf/Bp1380.pdf
That is a microphone, indeed. A B&K measurement microphone, that is.
(A note to those not familiar with B&K measurement equipment: These are
not quite like "normal" microphones. But they are of very high
quality.)
According to your linke, this microphone has a sensitivity of 50mV/Pa.
http://www.bksv.com/pdf/bp2111.pdf
And this is the preamplifier. (Which would, in audio, normally be
considered part of the microphone.)
This one has, according to the link, a peak output of 7 volts,
corresponding to an SPL of 138dB for a 50mV/Pa microphone. Your 94dB
signal is 44 dB below that. Which means that the output level after the
preamplifier will be
l = 7 * 10^(-44/20) = 0.044
And 0.044 volts is quite a bit below full scale line-level. However,
adding the 10x gain of your amplifier you should be at 0.44 v, which is
certainly in the ballpark of consumer line-level.
After looking closer at it, your setup actually seems to make some
sense. Your amplifier (the 4416) is not one normally used for
amplifying microphone signals, but rather accelerometers and the like.
(As your links says: "conditioner for use with ISOTRON(R) or other
piezoelectric voltage mode transducuers.")
But the preamplifier (the 2111) _seems_ to be of a special kind intended
just for interfacing microphones to this kind of amplifier, so you are
probably right in that it should work.
Asbjørn
