Battery powered DC plugs.

[notbradsohner]

I am trying to make a mobile setup for video, but I need a preamp that runs on batteries. If I picked up one of those little ART, Rolls, or Behringer pres that take DC adapters for power, is there some kind of battery pack that feeds a DC plug that I could run these things from? Basically, a wall wart that runs on batteries instead of AC power.

[punkin]

You'll need to do a little math but you might get away with a UPS. You can find them at Best Buy or CompUSA. They come in different sizes and can be fairly portable.

Something like this maybe http://www.bestbuy.com/site/olspage....=1157067061643

or like this; http://www.compusa.com/products/prod...k_UPS_1500_UPS

or a little bigger; http://www.compusa.com/products/prod...PS_XS_1500_UPS

If you shop around I'm sure you can find better prices...just bone up on the specs...some companies make it hard to compare apples to apples.

Good luck!

[notbradsohner]

I only need 9v at 900 ma

[notbradsohner]

Ok, let me ask you this. You many 9v's would I need to power a 700ma 9v unit for say, an hour?

[Zaphod B]

Originally Posted by notbradsohner

Ok, let me ask you this. You many 9v's would I need to power a 700ma 9v unit for say, an hour?

Probably just a couple of alkalines, I would think.

Edit: As I recall, my Boss DD3 digital delay stomp pedal draws about 350mA and it will suck the life out of a new 9V battery in about 2 hours.

The more 9V batteries you wire in parallel, the more life you'll get out of them. I should be easy enough to do a couple of trials for you to see how far you can get.

[notbradsohner]

Hmmm, so maybe, say 4 or 5 at a time should do it? I guess the only way to find out is to try. Psh, math.

[Zaphod B]

Yeah, that'll probably do it.

If this is something that you plan on doing a lot, you could buy rechargeable batteries. They cost more up front but will save you $$$ in the long run.

[notbradsohner]

So let me just make sure, I can never have too many batteries? Am I correct in understanding that the unit will only draw as much as it needs?