I'm trying to put together a good single power system for my rig, and I'm having a little trouble getting all the variables under control.
I've got:
NJB3: Needs 12v for auto adapter -- they only stable way of providing external power to this unit from experience + reading. These things are really nutty about batteries. No published draw, but it's got a 1600mAh battery which I get 160 minutes from, so guessing around 600-700mA.
AD-20: Takes a single 9v, but the manual (
http://www.denecke.com/files/ad20.pdf) indicates that it'll take anything from 6-24 volts via the jack in the battery compartment. This sounds pretty easy. 50mA draw.
PB224: Takes two 9v, 12v DC input w 2.1 x 5mm jack. 20mA draw.
It seems like with a, say, 800mA draw, A 7Ah battery should give me lots of recording time. Am I missing anything here?
Next, how to adapt everything... It looks like everything should run on 12v. It also seems like the NJB3 (via auto adapter) and AD-20 don't really need voltage regulation as the auto isn't going to provide it, and the AD-20 specs don't seem overly concerned w/voltage. But what about the PB224? Will I need some kind of voltage regulator for it?
I read the great post about DIY SLA, and this looks like the way I want to go. Lamp cord, Neutrik 4-pin XLRs, charger, check. Since I'd like to run all these off the same battery, I'm thinking I just build a cable with XLR on one end (to battery) and split to everything else from there, no?
A few last questions:
Is there anything ugly I need to know in terms of storing SLAs? If I mount everything in a case, am I going to have problems turning it sideways to carry it? I suppose it can't be left in the car on a Texas summer day, yeah?
Finally, I've read here that there are "drawbacks" to using a fuse. I can see why I *should* use one, but what are the "drawbacks?"
Thanks in advance for any advice you might have to give!
Chuck