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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