Could be an overlooked thing...
For the ones who don=B4't know about the principals of a pip circuit,
have a look at telinga.com / whitepapers / this is plug in power.
I wouldn't worry if, like in the old days, a resistor was used to
give pip voltage. But it isn't, it seems: For some reasons, perhaps
to increase input impedance, (?)
a current generator is used.
This may cause noise. On the other hand it could also lower the
noise, compared to a battery and resistor...
The tests I made last night with the LS-10 didn't show any
difference. But I had some difficulties setting the reference tone
because of insects.
I'll be back when I know for sure.
You noise measure people, Rod, Raimund, e.t.c. what do you think?
I mean, - for the mic-fet it doesn't matter if it's running on pip
voltage or a battery.
So what could cause the recorder to start generating low freq. noise
internally?
Klas.
At 00:51 2009-07-05, you wrote:
>Thanks Klas
>I'm not certain if this is an issue to worry about or something that has
>been over looked.
>
>On another note, when powering the EM23, be it PIP or a battery box,
>what voltage range do you recommend
>
>Thanks
>David
>
>Klas Strandberg wrote:
> >
> >
> > Thanks a lot for these links, I have suspected that pip may cause
> > noise at certain conditions.
> > Certainly not for HiMD, but for others...?
> >
> > I just wish that the Q-guy at
> >
> http://taperssection.com/index.php?PHPSESSID=3Ddc5cb19c3eae03a2a98a47d2a8=
b6b290&topic=3D106750.0
>
> >
> <http://taperssection.com/index.php?PHPSESSID=3Ddc5cb19c3eae03a2a98a47d2a=
8b6b290&topic=3D106750.0>
>
> >
> > had told how he connected the mic=B4s at the two tests.
> >
> > Just suppose that the output impedance was totally different! Then it
> > isn't the PIP causing the noise, but high impedance.
> >
> > I will make a test with LS-10.
> >
> > Klas.
> >
> > At 10:44 2009-07-03, you wrote:
> > >Hi David,
> > > SonicStudios has a good site with various PIP
> > > recorders and graphs that show the effect of PIP vs external mic powe=
r:
> > >
> > >http://www.sonicstudios.com/tips.htm#decks
> > <http://www.sonicstudios.com/tips.htm#decks>
> > >
> > >BR,
> > >Mike.
> > >
> > >
> > >--- In
> > <naturerecordists%40yahoogroups.com>, "dsecomb2"
> > <> wrote:
> > > >
> > > > Hi All
> > > >
> > > > I been looking at a new recorder to replace the Sony minidisk. I
> > > have been focusing on recorders that have PIP ( plug in power) to
> > > run a pair of Telinga EM 23's. Wanting to keep it simple the
> > > thought a of power box meant extra cables and more connections for
> > > something to go wrong.
> > > >
> > > > I have come across the below link that I found in the Sonic
> > > Studio Website. ( http://www.sonicstudios.com/tips.htm#decks
> > <http://www.sonicstudios.com/tips.htm#decks> )
> > > >
> > > >
> > >
> >
> http://taperssection.com/index.php?PHPSESSID=3Ddc5cb19c3eae03a2a98a47d2a8=
b6b290&topic=3D106750.0
>
> >
> <http://taperssection.com/index.php?PHPSESSID=3Ddc5cb19c3eae03a2a98a47d2a=
8b6b290&topic=3D106750.0>
> > > >
> > > > Each recorder that has been illustrated behaves differently but
> > > all show a noticeable increase in noise at the low frequencies when
> > > PIP was used. If this is correct has any one done a side by side
> > > comparison of PIP on v's PIP off. I'm interested know if one is
> > > going to hear the difference. I know of some nature recordest who
> > > have a fine appreciation of very LF. For me, recording birds is my
> > > interest and I'm struggling to get some pigeons and button quails
> > > that have very deep call. I assume having an increase in LF noise
> > > is going make that harder.
> > > >
> > > > Thank you for your replies.
> > > >
> > > > Cheers
> > > > David
> > > > Western Australia
> > > >
> > >
> > >
> > >
> > >
> > >------------------------------------
> > >
> > >"While a picture is worth a thousand words, a
> > >sound is worth a thousand pictures." R. Murray Schafer via Bernie Krau=
se
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > Telinga Microphones, Botarbo,
> > S-748 96 Tobo, Sweden.
> > Phone & fax int + 295 310 01
> > email: <telinga%40bahnhof.se>
> > 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
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