Hi Curt!
Yes, the gain goes up with a higher voltage and higher resistor, but
over a certain point, the noise is linear with the gain, so actually
it doesn't matter, unless the mic gain is so low that the recorder
input noise goes on top of the mic noise.
This preamp uses a current generator instead of a resistor, like Sony
has been doing all these years, so the mic will take the PIP current it nee=
ds.
An interesting thing with this preamp design is that you can use long
cables (how long??) between the mic and the preamp. I wouldn't be
surprised if you could use 100 meter low quality cable, still don't
get hum or (much) loss of high frequencies.
Tomorrow morning I will make a recording outside my house, with SSM
mic's into a Sony D-50 and another SSM via the preamp to a Zoom H4n,
which has a noisier input.
I think people spend more money than needed on a low noise recorder,
even though they don't like the recorder itself. A friend in
Stockholm recently bought a D-50 because of it's low input noise,
even though he doesn't like the price / size / weight and handling of
it. I want people to be able to choose any recorder, with a timer
setting for example, even if it has a poor preamp.
Good to hear from you!
Klas.
At 17:04 2013-01-19, you wrote:
>Klas,
>
>I have observed that certain PIP mics seem to perform better with
>higher PIP voltage (like, 9v vs 2.6v, for example). What voltage
>does this box deliver?
>
>Curt Olson
>
>On Jan 19, 2013, at 8:49 AM, wrote:
>
> > 1a. New Telinga PIP Stereo preamp.
> > Posted by: "Klas Strandberg" klasstrandberg
> > Date: Fri Jan 18, 2013 10:04 am ((PST))
> >
> >
> > After the very interesting, but quite confusing, thread about "preamp
> > issues" called "EIN values and bits and peaks" discussed here, I made
> > an effort to solve the agony with choosing recorders cause of their
> > (actual or presumed) preamp noise!
> >
> > http://klas.telinga.com/private/IMG_5455.JPG
> >
> > It is a light weight plastic box with a 9v battery. It has two slide
> > switches, one that is switching the battery on/off and the other one
> > switching the gain between 55db and 35db. There is a 3,5 mm input
> > for a PlugInPower stereo microphone and a 1 meter output cable with a
> > 3,5 mm male.
> >
> > * No more worries about recorder input noise values!
> > * Current regulator gives the lowest noise possible for all PIP
> microphones.
> > * You can use long cables from the microphone to the Telinga preamp.
> > * Clipping output level is 700mV RMS into 2,2k
> > * Total weight is only 160g incl. battery.
> > * Current consumption is only 2mA (Sic!) which means that it
> > runs >100 - 150 hours on a 9-volt alkaline battery, depending on the
> > needed plug in power current.
> >
> > Even though the use of transistors and other electronic's is
> > uncontroversial, this kind of preamp design has never been made
> > before! As I see it, it must be ideal for naturesound recordists.
> >
> > If it will become an official Telinga Preamp or not, depends on the
> > interest. I will make 5-10 in a first batch, to be delivered in 6
> > weeks. It will be sold to members on this list for 200 USD + shipping.
> >
> >
> > Klas.
> >
> >
> >
> > Telinga Microphones, Botarbo,
> > S-748 96 Tobo, Sweden.
> > Phone & fax int + 295 310 01
> > email:
> > website: www.telinga.com
>
>
>
>------------------------------------
>
>"While a picture is worth a thousand words, a
>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
>
>Yahoo! Groups Links
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
website: www.telinga.com
|
