Useful comments, Richard. Thank you.
But does that mean that the impedance converters of the capsules are
running on the 9V supply?
If so, does the max SPL suffer, as it does on most microphones running
off reduced supplies? On P48 I'm guessing the Class A stages run from
~30V rails.
Chris Woolf
On 24-Jul-16 06:31, Richard Lee wrote:
The Tetramic spec declares 3.5mA x 4 capsules (=15mA) @48V - that's
720mW
But to power through the PPac it's 9-12V @<10mA - that's 90- 120mW - a
big difference.
The P48V current consumption is pessimistic. Powering directly bypasses
the regulation required for P48V.
You also avoid noisy P48V in some (many?) prosumer recorders though PPAc is
pretty immune to this. It was designed with wall plug adaptors in mind but
do check out the one you want to use.
I use an alkaline PP3 rubber banded to the PPAc. Make sure you have the
correct connector.
For an important recording, use a new ALKALINE PP3. Probably 10 hrs life
http://data.energizer.com/PDFs/522.pdf
I regard batteries as consumables and the cost is trivial. I do stage
sound and find it easier to use new batteries than to try & ensure 24
batteries for 12 radio mikes are all fully charged.
A bag of PP3s costs less and will weigh less than chargers etc
But really anything which will supply 9-12VDC will do.
I've suggested to Len we sell a deluxe PP3 connector with O2-free Cu,
insulated with the scrotums of Cooktown kangaroos, all hand carved from
solid Unobtainium by Virgins .. shut up Lee ... just SHUT UP!
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