Aaron,
I have an idea for you. Have you considered just buying a power inverter (=
I just got a 12v to 120v pure sine wave inverter for charging from my car b=
attery for $28.00 from a retail marine supply store) and just pluging the S=
D 7XX into the inverter using the AC power adaptor that came with the unit?=
Simple and cheap. You can use the inverter to charge you other batteries=
when you are on long trips as a bonus too.
Jason Puddifoot
--- In "John Hartog" <> w=
rote:
>
> Hi Aaron,
> Sounds like you are moving up from One Minute Vacations to One Day Vacati=
ons:) I was just thinking about a similar project last night.
>
> Of course rechargeables are more cost effective and eco-friendly for long=
term projects, but if you do not plan to need this on a regular basis cons=
ider disposable alkaline D-cells. Walgreens drug store often has sales on =
their house brand for $8 for a dozen.
>
> Shoot for higher in the (9-18v)voltage range. A 12 D-alkaline pack will p=
rovide 18v under load: I must warn however, the initial spike of ~ 20v coul=
d be harmful. Could run it down a bit first, or otherwise a 16.5 pack. That=
might be ideal: two parallel packs of eleven D-alkaline might provide the =
28 hours you are going for.
> I have been using plastic battery holders for this: I tape them up well s=
o the batteries cant move.
>
> That does seem like a lot of battery waste though, doesn't it? Especially=
since you would want to test it at least once, or twice.
>
> Do not rely on the battery switchover feature of your 7xx, as it may not =
be reliable.
>
> I don't know of commercially available power cords, but you could get one=
custom built. Attaching the 4-pin hirose is the hardest part. You could ma=
ke it a much easier job by using the cable from a SD power supply and solde=
ring on the necessary connector. I have been using Tamiya style connectors =
to switch between power supply, battery packs, and car lighter adapter.
>
> John Hartog
>
>
>
>
> --- In Aaron Ximm <aaron.ximm@> wrote:
> >
> > Hi,
> >
> > Can anyone give me the quick run down on what's needed to run a Sound
> > Devices 7 series recorder off a 12V (?) lead acid battery?
> >
> > I need to do some uninterrupted recording on the order of 24-28 hours,
> > two channel, probably 24/44, with a 722, providing phantom on both
> > channels. As are as I can tell I will need a pretty beefy battery --
> > anyone have field experience on what I really need? I was thinking a
> > 26Ah battery would be conservative. Not to mention ridiculously heavy,
> > but I don't need to transport it into the back country, so that's OK.
> >
> > My specific questions are:
> >
> > Any guesses on the capacity I should really pursue?
> >
> > Is there a commercially available power cable adapter that terminates
> > in the appropriate connector for the 7 series recorders, and has
> > spades on the other end for batteries?
> >
> > Do I need a lead acid battery charger? I have a lead on some very
> > affordable ones, but is this a must- or a nice-to- have?
> >
> > Any tips/pointers much appreciated. :D
> >
> > Thanks,
> > aaron
> >
> > --
> > aaron.ximm@
> > quietamerican.org
> > oneminutevacation.org
> >
> > 83% happy
> > 9% disgusted
> > 6% fearful
> > 2% angry
> >
>
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