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?=20
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 wondering =
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 minimum=
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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