Yes, 3v and 0,6 mA means a 4,7k resistor.
Then, of course, the voltage drop over this resistor would be twice
compared to a 2,2k resistor.
A delusive factor is something that resembles a drifting operating
point. At voltages below 5v, the current consumption of EM172
increases with increasing SPL. When keeping the capsule in the same
SPL for up to 30 sec, the current consumption goes down again. And
the bigger resistance, the bigger voltage drop.
That is why I made my tests with the mic=B4s in a 100db SPL.
At a lower driving voltage than 0,5v one can see how the negative
phase flattens out a fraction.
Right now I am digging into cooling down the Olympus and mic's in the
freezer to find out if there is any difference in mic / noise
behavior between using Ni -Mhy batteries vs. Alkaline.
It is possible. I have heard amplifiers before making more noise when
the batteries go cold and the impedance go up. One must remember that
there is no big space in the recorder for a big capacitor over the batterie=
s.
I will know when I get up tomorrow morning and listen to the start of
the file compared to the end of it.
Klas.
At 11:15 2012-03-22, you wrote:
> > What I have measured is that the Telinga SSM behaves fine down to
> > 0,5v PIP voltage and 2,2kOhm load in a SPL of 100 db and that I see
> > no need to make extra boxes to increase the driving voltage.
>
>Hi Klas,
>
>That's interesting. It seems however that the SONY D50 and M10 have
>a 4.7 kOhm PIP supply resistor connected to the internal 3 V supply
>(the short circuit current on my SONY M10 is 0.6 mA). Could it be
>that this larger resistor might perhaps make a difference?
>
>Regards,
>Raimund
>
>
>
>
>------------------------------------
>
>"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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