Hi Zach--
Right, 2-A's can go pretty fast. Maybe a little cheaper solution is
to use the NIMH D cells by energizer or ray-o-vac. They are very
light weight, recharge many times and the manuf charger runs about
$25. I use a 5 D battery sled to power a DAT recorder, phantom mics
and the Mp2. Depending on monitoring volume and operating temperature
the package often goes 6 hours in the field. Easy to carry along 5
more D's.
Rob D.
=3D =3D =3D
>wow. I had no idea they ran that hot! I have actually had the MP-2 die at
>the near end of a 3 hour session using two 451's and two new AA's. I
>believe that two NSS workshops ago, I was using Dan's MP-2 and it too was
>going low on power with the AA pair. I'm not going to be using this out in
>the woods, this is purely for location recording in chuches, theater, etc
>where the pre isn't near any outlet, so weight really isn't going to be a
>concern of mine-- I'm strictly going for longevity.
>My concern for using some of those suggestions you listed are about
>charging. I have no way to charge an RC pack, I can't seems to find a NIMH
>charger for less that $100 (or is that lithium) and it seems that a pack
>with 5 C's in it is going to be about the same bulk/weight as a lantern
>battery. And how would you charge those puppies?
>
>
>At 08:04 PM 12/8/02 -0500, you wrote:
>>DeafinONEear wrote:
>>> Given the versatality of the MP-2 power supply stage, I was thinking I
>>> would like to power mine with a 6v lantern battery, but I was wonderin=
g if
>>> anyone would happen to know what the mA rating on one of those is. Has
>>> anyone used a lantern battery to power one? Does anyone know the minim=
um mA
>>> rating I can use for a 6V feed? The site says 50mA for a 12V, so I don=
't
>>> know how that would equate to a lower voltage.
>>
>>That's one heck of a lot of overkill. The lantern battery can do a few
>>amps, though in most uses they are run under a amp. I think they mostly
>>run between 2000mAh & 5000mAh
>>
>>I run mine on two 1800 mAh NIMH AA's in the internal battery
>>compartment. Most I've run so far would be about 5 hours powering two
>>phantom power mics (MKH-20's) and the led display at the half setting.
>>That all in a number of sessions. The batteries were not near discharged
>>if the charge time is any indication.
>>
>>I've gotten 3 hours out of some near dead AA Nicads.
>>
>>I'd say the lantern battery is a lot of weight, bulk and money for the
>>time you would get out of it. Rechargables make more sense. You could
>>get 6V 4000mAh NIMH battery pacs made with 5 C cells off ebay right now
>>for about the same price. Or get the pacs used for RC cars. If you need
>>a long run time that is. Otherwise the AA's will do it.
>>
>>Note, the early MP2 design included a contact spring that would not
>>contact some NIMH rechargables properly. Mine was one of those, even
>>though it was new this year. Sound Devices upgraded it for free to the
>>new spring (requires sending it in for a battery compartment
>>replacement, the spring is riveted in). I machined some thin brass disks
>>to fix that before finding this out.
>>
>>Walt
>>
>>
>>
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>>
>
>
>(=BA=B7.=B8(=A8*=B7.=B8 =B8.=B7*=A8)=B8.=B7=BA)
>=AB.=B7 =B0 =B7. ZacH .=B7 =B0 =B7.=BB
>(=B8.=B7=BA(=B8.=B7=A8* *=A8=B7.=B8)=BA=B7.=B8)
>
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Rob Danielson
Film Department
University of Wisconsin-Milwaukee
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