[Top] [All Lists]

Electret Mics on 48v (was Experience with BT-BI158's?

Subject: Electret Mics on 48v (was Experience with BT-BI158's?
From: "Rob Danielson" danielson_rob
Date: Tue Dec 11, 2007 1:00 am ((PST))
At 1:03 PM +0000 12/10/07, scottsherk27 wrote:
>  > I do not think there are any low-cost, low-noise, small mics that
>>  will run on PIP.
>>  As the Sony PCM-D50 only has a PIP external mic input and the
>  >Fostex FR2-LE only has 48 volt phantom inputs, perhaps we should dig-up
>  >the simple mods allowing electret mics tp run on 48v. For low-profile,
>  > stereo imaging and other flexibiilities, I'd much rather have
>>  head-wearable EM-158's or WL-183's than X-Y recorded mounted
>  > electrets. Rob D.
>For the record: I've been using my EM-23's with my Fostex FR2-LE
>very successfully. I use the Sound Professionals Phantom Power
>Adapter which is currently on sale for $25!
>Very clean sound.
>Scott Sherk

Thanks Scott! Sounds like Sound Pro's SP-XLRM-MINI-2 adapter cable 
might use 47K ohm resistors on #2 pins of the XLR connectors with 
pins 1 & 3 "tied."  If it work acceptably with 183's and other 
electrets, its a very simple mod. $25 is hard to beat, too.  Perhaps 
you can see a resistor in each XLR connector, perhaps yellow, violet, 

At 8:44 AM -0600 12/10/07, Curt Olson wrote:
>Rob, is there a chance you can point us to such a mod?

The MicBuilders list would be a good resource for this. The article 
on DIY WM-61A electret capsules in Tape OP years ago used a 9 volt 
battery and provided XLR connections. This circuit is larger profile 
than many might prefer and is not specifically for 183's.  The 
article used to be available through Here's a 

More generically for electret capsules,Tomi Engdahl  has provided a 
few circuits:

I'm not sure what the latest wisdom on the best circuit is and if the 
183 capsules differ somehow. I guess one could A/B compare the 
options including the MX-183 and a P-XLRM-MINI-2.  Rob D.


<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU