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Re: Battery phantom power supply

Subject: Re: Battery phantom power supply
From: "John Hartog" hartogj
Date: Wed Mar 28, 2007 10:21 am ((PDT))
They both seem to work the same to me. The Phantom II costs a little
less than the PB224.

For extended duration recording, I use a 12 AA sled (>14 volts) for
both the PB224 and the Phantom II.  12V is the minimum requirement for
both models I believe.  As the supply drains below 12, the recording
begins a slow fade towards nothing.  The manual for the PB224
specifies a 12 to 18V supply.  Regarding the Phantom II, I wrote ART
and they responded with the following:

"The internal Phantom power supply is filtered and regulated so that
it can handle a fairly wide range of supply voltages. As long as the
external supply is over 12 Volts DC then the internal circuitry will
maintain the Phantom voltage at either 12 Volts or 48 Volts (depending
on switch position. As far as a high end on the voltage, we would
suggest staying under 24 Volts on the high end. In fact if you install
two 9 Volt batteries, they are placed in series and are therefore
providing 18 Volts to the circuitry. If the supply drops below 12
Volts DC then the unit does not regulate the voltage so supply
fluctuations may feed thru at a low level, but the supply will still
work though it's output DC voltages will drop proportionate to the
supply voltage at that point. This allows for "soft failure" in remote
recording situations where even though the supply is lower and the
phantom power is lower you will still be getting enough signal to keep
the mics live for a while longer."


John Hartog




--- In  Curt Olson <> wrote:
>
> I can't compare it with the Rolls PB224, but I've been very happy with
> the ART Phantom II I picked up last year. I recently ditched the unit's
> metal case and XLR connectors, bringing its weight down from 20 ounces
> to less than 6, including two 9-volt batteries. It still performs just
> fine, only now it can easily slip into a shirt pocket. (Obviously, I've
> given up whatever RF shielding and physical protection the case
> provides.)
>
> Rob and others have rigged up 12-volt battery sleds for the ART's DC
> input. I haven't gone that route yet. If you choose to run it off
> 9-volt batteries, it would be a good idea to replace the flimsy stock
> battery connectors with something more substantial.
>
> Curt Olson
>
> Max wrote:
>
> > I want to buy a battery 48V Phantom Power supply like the ART phantom
> > II or Rolls PB224. Rob Danielson often uses the Rolls in his tests,
> > but the ART is also metioned. I browsed the posts on those but
> > couldn't find any direct comparison. So my question would be:
> >
> > Does anyone know of advantages of the ART over the Rolls or vice
> > versa? I'm thinking of weight, stability of power supply, current
> > drain, quality of construction, ease of use, noise level and so on.
> > The price is less important to me since they are both relatively
> > low-cost (so if there's any device three times the money but more
> > reliable in some way that'd be interesting too..)
>






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