Hi Chris!
I recommend that you connect both mic's and measure the DC current
from the battery. Then divide the mAh figure on the battery with the
measured current. That the power supply needs 45mA at "full load"
doesn't tell how much current it draws to deliver 3 + 3 mA to your mic's.
If you can't measure it, you have to guess: Suppose the power supply
needs 25 mA to deliver 3+3 mA to your mics, then: 25 + 3 + 3 =3D approx
30 mA. A 900 mAh battery will run for 900 / 30 =3D 30 hours.
Klas.
At 17:00 2013-04-07, you wrote:
>Dear all,
>
>It is beyond my ecological brain capacities to do this calculation
>but I am sure it is an easy one for some of you here....
>
>If I power a pair of AT3032's with an ART Phantom II Pro on a
>regular 9V battery, how long can I reasonably expect it to last ?
>
>My AT3032 specs say they need 11-52V DC, 3.0 mA typical. My ART
>Phantom says it delivers 48V typical; with a current drain of 10mA
>with no load and 45mA full load (two mics).
>
>I am sure there is an equation but I failed physics. Thanks to
>clever folks who can keep me straight !
>
>Chris
>
>
>
>------------------------------------
>
>"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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