I have had a few complaints from people that this list is becoming the mic
builders list, a few have unsubscribed until it gets back to what was
intended to be "Nature Recording"
Please keep ON subject....
Martyn
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Martyn Stewart
Bird and Animal Sounds Digitally Recorded at:
http://www.naturesound.org
Redmond. Washington. USA
N47.65543=A0=A0 W121.98428
e-mail:
Tel: 425-898-0462
Make every Garden a wildlife Habitat!
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-----Original Message-----
From:
On Behalf Of Rob Danielson
Sent: Saturday, September 03, 2005 11:03 AM
To:
Subject: Re: [Nature Recordists] Mic attenuation on purpose (was Min mV/Pa =
4
MD..
Hi Mike-- Thanks for your thoughts. Methinks this is getting too
technical for the list. Let me know, off list, if its okay for me to
follow-up, off list. Rob D. <>
=3D =3D =3D
At 12:33 PM -0500 9/3/05, Mike Feldman wrote:
>Rob Danielson wrote:
>
>>... I'm looking into the
>> nature of small circuit built into the unbalanced, 3.5mm cable that
>> Rode provides with the NT-4. I've by-passed the circuit in my NT-4
>> cable and mic output jumped up 12dB-- the same dB drop in output (and
>> increase in noise)...
>> I'm waiting to recommend the simple cable modification until I can
>> figure out if there are bad consequences I've not grasped. Here's
>> what I think** the circuit is should anyone have ideas:
>> http://www.uwm.edu/~type/Mic%20Preamps/NT-4ConnectorCircuit&ModSm.jpg
>
>If I'm reading your drawing correctly, you're shorting the series
>resistor of the pad, but not opening the parallel resistor. So there
>would still be some attenuation dependent on the input impedance of
>the sink.
>
>> **umashankar mantravadi, who is on this list, has commented on the
>> micbuilders list that my circuit drawing looks more like line to mic
>> pad, which, I assume, would have much greater attentuation than
>> -12dB. Maybe the four tiny components on the pcb are not simple 10K
>> resistors, as labeled and measured? I dunno. I think I have the basic
>> circuit structure right though. Rob D.
>
>Sure looks like an L-pad. You mentioned earlier they're labeled EDI
>on the pcb ... "Electrostatic Discharge" current limiter perhaps?
--
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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