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Author Topic: New rig: Bruel & Kjaer measurement mics,  (Read 5302 times)

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Offline illconditioned

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New rig: Bruel & Kjaer measurement mics,
« on: June 05, 2013, 12:39:45 AM »


My new rig consists of:

Bruel & Kjaer 4145 (x2), B&K 4190 (1) -->
ACO Pacific 4012 preamp (x2) -->
ACO Pacific PS9200 200V dual channel PSU -->
Sony PCM-D50

4145 is a 1" measurement microphone, nickel diaphragm, 10-146dBA range.  Vintage capsules, 1970 and 1974!
4190 is a 1/2" microphone, 14.6-146 dBA, more recent (1995?).

So far I'm just recording ambient (thunderstorms, water/waves, etc).

  Richard
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Offline page

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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #1 on: June 05, 2013, 10:13:53 AM »
I admit, that's sexy in a middle aged woman type way.
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Offline illconditioned

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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #2 on: June 05, 2013, 10:32:03 AM »
Oh yeah, the white tape on the right mic is to hold the windscreen.  I'm using DPA windscreens right now. Need something better for outdoor recording.

  Richard

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Offline Gutbucket

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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #3 on: June 05, 2013, 10:44:56 AM »
Very nice.

I was wondering about the white tape.

I'd think those will be just the ticket to measure wind turbine noise.
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Offline dallman

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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #4 on: June 05, 2013, 03:14:06 PM »
It looks great Richard! I was tempted to open the package when it was in my hands, but couldn't bring myself to do it! You may want to post some samples...
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Offline illconditioned

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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #5 on: June 05, 2013, 04:34:44 PM »
This is an "old school" system.  The white box looks like something Niaint or Church would build.  It takes a 9V battery and generates a 200V polarization voltage for the capsules.  The "preamps" run from +28V.  I have not opened them, but it is likely just a FET and maybe a line driver.  The connectors are: ground, +200V, +28V, and signal out (unbalanced).  Outputs are buffered by an opamp and output on a pair of BNC connectors.  This can also work with electret capsules by removing the polarization signal.

I will report back when I get some measurements.

  Richard


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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #6 on: June 05, 2013, 04:39:26 PM »
Quote from: illconditioned on June 05, 2013, 04:34:44 PM
It takes a 9V battery and generates a 200V polarization voltage for the capsules.

damn.

I knew they were 200v caps, but that the box is powered by a 9v with some amperage is rad.
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"Nostalgia ain't what it used to be." - Jim Williams

Offline illconditioned

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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #7 on: June 05, 2013, 07:45:10 PM »
Quote from: page on June 05, 2013, 04:39:26 PM
Quote from: illconditioned on June 05, 2013, 04:34:44 PM
It takes a 9V battery and generates a 200V polarization voltage for the capsules.

damn.

I knew they were 200v caps, but that the box is powered by a 9v with some amperage is rad.

Polarization uses almost no current.  Ideally no current.  The box in question runs for >40hrs on a single 9V battery.  The output has a series 11MR resistor.  Inside the preamp, there is something like a 10GR resistor.

  Richard
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Offline Bernd Out

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Re: New rig: Bruel & Kjaer measurement mics,
« Reply #8 on: June 05, 2013, 08:46:12 PM »
Quote from: page on June 05, 2013, 10:13:53 AM

I admit, that's sexy in a middle aged woman yoga instructor type way.


FTFY         ;D
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