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Re: Preamp for PIP mics

Subject: Re: Preamp for PIP mics
From: "D Secomb" dsecomb2
Date: Wed Dec 9, 2015 3:14 am ((PST))
The ideal way would be to bypass the recorders preamp but just need to
find something at the right price to do it with.
David

On 9/12/2015 11:15 AM, Norman Davies 
[naturerecordists] wrote:
> hi, some "PIP" recoders provide more than 3v. The Sony D100 provides
> 5v. A few others do too, but I'm not familar with the others. Someone
> else might comment on those.
>
> As for a staging amp between a mic and a recorder mic input, if I were
> you, I'd skip the recorder's mic input ( going by my rough gist of
> where you are coming from, here ) and get a sweet sounding preamp that
> outputs a roughly line level signal into the line input of your little
> recorder.
>
> norman.
>
>
>
> On Wednesday, December 9, 2015 12:38 AM, "D Secomb
>  [naturerecordists]"
> <> wrote:
>
>
> Hi Eric
> Yes the preamp is between the mic and the recorder which normally
> supplies PIP for the mic but with the preamp which one supplies the
> power. A boost from mic to recorder is what I desire. Does the batery
> box you describe does the. Does the EM172 handle 12v very well?
> David
>
> On 9/12/2015 8:12 AM, Eric Benjamin 
> <> [naturerecordists] wrote:
>> I think that we need more information. Do you intend this preamp to
>> go between the PIP microphone and an existing PIP input?
>>
>> PIP has some fundamental limitations. It is basically defined by a 3
>> Volt supply and a 2k pullup resistor. The resistor gives rise to a
>> minimum noise floor, and the 3 V supply limits the maximum voltage to
>> about 1 V rms. If those were the only limitations then the
>> performance could be very good. A so called battery box helps by
>> allowing a higher battery voltage and perhaps a higher value pullup
>> resistor. As an example, the Primo EM172 is spec'd at -28 dBV/Pa and
>> 80 dB SNR and 122 dB SPL maximum acoustic level. But that is with a
>> 5V supply and a 3.9 k resistor. With 3V and 2k all of those specs
>> will degrade slightly.
>>
>> You could build a battery box with those values and get the specified
>> performance from the mic capsule. But there will still be a
>> limitation on the maximum signal that can be accepted by the preamp
>> in the recorder. That is, the preamp will clip. If you only want to
>> record quiet sounds, then the overload will probably not occur.
>>
>> To do a complete job on the interface design we need more info on
>> your microphones and recorder.
>>
>>
>> ------------------------------------------------------------------------
>> *From: * D Secomb 
>> <> [naturerecordists]
>> <>
>> <>;
>> *To: * <>
>> <>;
>> *Subject: * [Nature Recordists] Preamp for PIP mics
>> *Sent: * Tue, Dec 8, 2015 11:08:22 PM
>>
>> Hi all
>> I have been toying with the idea of a preamp to go with a Sony and
>> Telinga EM23 setup but having a lot of trouble finding any that are
>> suitable for PIP 3.5mm gear, all phantom XLR types. Any suggestions.
>> Cheers
>> David
>>
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>> 12/08/15
>>
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com/>
> Version: 2015.0.6176 / Virus Database: 4477/11143 - Release Date: 12/08/1=
5
>
>
>




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