Topic: JB3 external power

[dklein]

or a 9.6 or 7.2v NiMh !

Note that a 6v doesn't have enough overhead for the regulator to work properly.

I made one wiring harness that splits a 9.6 into power for a UA-5 and the JB3 (using a 12v car adapter to regulate down for the JB3).

[Ed.]

ok, i'm really bad at this battery stuff, but i'd really like to get a setup for the festivals this summer.  

would it be more economical for me to get a handful of the NiMh batteries or just one SLA.  also, whats a good place to buy sla's and whats a good model to get to hook up to the nomad?  nothing else would be running off of it at the moment, maybe in the future tho.

also, once i got all of this, would i use the normal nomad batteries first, then when they start running low, plug the sla in and charge them back up, or just run the sla and forget about the internal batteries?

thanks in advance
ed

[bhadella]

or a 9.6 or 7.2v NiMh !

Note that a 6v doesn't have enough overhead for the regulator to work properly.

I made one wiring harness that splits a 9.6 into power for a UA-5 and the JB3 (using a 12v car adapter to regulate down for the JB3).

I, for one, would love to know (specifics, specifics, specifics) what you did to split the power between the two!!!!  If I could just use my 9.6 V Ni-Mh batteries to run everything, I would be set come festival time (and the rest of the time too )  

[sickrick43]

It's gonna come down to portability and personal preference.

As demonstrated many times on this board, everyone has thier own preference.

For portability, SLA's are kinda heavy to lug around, but they "usually" give you the longest, most stable power.  Thier discharge curve is more stable than NiCad/NiMH rechargables and have much higher current levels.  But if you're ONLY running a NJB3, you can get away with something smaller than a 7ah ecocharge.  I already had them to run my V3/D-10 Pro.

DIY regulators will work, but since the JB3 is very finicky about it's input voltage, the SUREST way for it to work correctly, is to get Creatives Car adapter, and modify it to work on the 12V battery of your choice.

In festi mode, you could run a "fully charged" JB3 of your SLA, and if that started getting flat, or you got concerned about having enough juice left to run your pre-a/d for the duration, you could unplug the JB3 (though not in the middle of recording) and get the full capacity (5-6 hrs) off the internal batteries.

There will be as many opinions here, as there are people running JB3's.  IF they WORK, they are all good suggestions.  Which one you choose, depends on your budget, your willingness to haul additional weight (in the form of SLA's), your competence (and faith) in constructing an "off-label" DIY regulator/battery combo, and a couple of other factors.

For me personally, I'm comfortable with the internals, in a single band 3-4 hour gig, and running the Creative Adapter off the 12V SLA for longer gigs - but since I'm hauling the SLA anyway, I just use IT all the time.

Your Mileage May Vary...

Rick

[F.O.Bean]

nice rick, i think im gonna do this soon enuf!!

could i get away w/ soldering a 4-pin directly onto the 12 car adapter???i think thats prolly the route i'll go!!!

[sickrick43]

nice rick, i think im gonna do this soon enuf!!

could i get away w/ soldering a 4-pin directly onto the 12 car adapter???i think thats prolly the route i'll go!!!

Don't see why not.  Cord's a little thick for the strain relief, but you should be able to get it in there.

Gotta look 100X better than your Hosa abortion...
(only KIDDING bean-o   touchy, touchy    )

Rick

[Swampy]

Bean, let me know where you buy the car kit from... As soon as I sell my 7pin and d8, Im getting everything I need for the jb3.

[F.O.Bean]

nice rick, i think im gonna do this soon enuf!!

could i get away w/ soldering a 4-pin directly onto the 12 car adapter???i think thats prolly the route i'll go!!!

Don't see why not.  Cord's a little thick for the strain relief, but you should be able to get it in there.

Gotta look 100X better than your Hosa abortion...
(only KIDDING bean-o   touchy, touchy    )

Rick

I KNOW

i think im gonna go that route, i have 3 or 4 4-pins lying around, so i am gonna do that, and then im calling kindkables and seeing if they'll do a 12 7.2a for me, im sure ed will tho

[F.O.Bean]

im just gonna keep my eyes peeled for ebay prolly, if you find somewhere, let a brotha know;-)

[dklein]

I, for one, would love to know (specifics, specifics, specifics) what you did to split the power between the two!!!!  If I could just use my 9.6 V Ni-Mh batteries to run everything, I would be set come festival time (and the rest of the time too )  

The quick answer is you take the power from the battery and run it to 2 separate sets of cables.  One of them terminates with the UA-5 connector, the other one goes to the input of a car adapter.  The car adapter output (set at 4.5v) terminates with the JB3 power connector.

Just watch the polarity as you wire it up.

[Swampy]

im just gonna keep my eyes peeled for ebay prolly, if you find somewhere, let a brotha know;-)

Ill let you know where I find the cheapest one.

[sickrick43]

Bean-o,

As I mentioned in another thread, on MINE the wire with the writing on it was the NEGATIVE WIRE.  Verify this on yours by dis-assembling the cigarette lighter adapter (watch the spring, it FLIES).  The wire connected to the FUSE is the POSITIVE, the one connected to the side contacts is NEGATIVE.

Solder these to the appropriate pins on the XLR/4 and you're set.  MAKE SURE you got it right.  If you don't, you'll most likely burn the regulator in the adapter, and eve tho these have a screw under the label, that plastic case is glued together also.  No fun to take apart.

Rick

[Ed.]

how long will a 7ah sla last?  i think i may be doing this whole thing shortly.  seriously, an sla is like $20, the car adapter is like another $25, it seems like a better option than buying more internals to me.

i'm kinda excited about this, i'll get to solder stuff...heh, soldering is so much fun.

[F.O.Bean]

i dunno recording time ed, but i bet rick does!!! well, youre gonna need a 12v charger too ed, so that another couple bux too!!

[Swampy]

how long will a 7ah sla last?  i think i may be doing this whole thing shortly.  seriously, an sla is like $20, the car adapter is like another $25, it seems like a better option than buying more internals to me.

i'm kinda excited about this, i'll get to solder stuff...heh, soldering is so much fun.

( Battery Capacity [mAH] / Current Draw [mA] ) * ( .80 )