JB3 external power

[Swampy]

STILL FUCKING GOING!!! 48 HOURS OF RECORDING AND STILL GOING!!!!!!!!!!!

[F.O.Bean]

man, that is crazy!!!

i may just get a 4.2 amp batt, and save a lil weight then!!!

[Swampy]

Ya, at this point, the only reason for a 7.5 is if you wanna record a whole festie and dont mind the weight! I cant beileve that its still going!

[F.O.Bean]

Ya, at this point, the only reason for a 7.5 is if you wanna record a whole festie and dont mind the weight! I cant beileve that its still going!

i will still prolly get a 7.2 tho, cause im sure a lil bit more juice is being sucked w/ higher levels, since its consuming more bits or something maybe, but you could def get a whole 20 Gb w/ one batt safely, basically 2 jb3's full, w/ this thing, i may just get a 40GB model

[Swampy]

i may just get a 40GB model

I kind of want to get another before I go down to Bonnaroo...

[F.O.Bean]

nice, but thats alot of music bro, ALOT!!!

good luck tho, and hvae phun down there, it gets H-O-T!!

[Swampy]

okay, so this sucker finally ran out... It got about 50 hours on a 7.5ah batt. So if my calculations are correct:

Battery mAh (7.5) times current draw (x) times .80 = run time (50)

So that would make x=8.3... So the JB3 current draw is 8.3 according to my calculations. Does this sound right? I hope I did it right!

EDIT, see Brian's post below

[Brian Skalinder]

okay, so this sucker finally ran out... It got about 50 hours on a 7.5ah batt. So if my calculations are correct:

Battery mAh (7.5) times current draw (x) times .80 = run time (50)

So that would make x=8.3... So the JB3 current draw is 8.3 according to my calculations. Does this sound right? I hope I did it right!

Not quite.  Your initial equation is wrong: should divide battery mAH by current draw, not multiply.  And 7.5 is the batt capacity in AH, not mAH - should be 7500 mAH:

( battery capacity / current draw ) * .80 = estimated run-time
( 7500 mAH / X ) * .80 = 50 hrs
( 7500 mAH ) * .80 = 50 hrs * X
( 7500 mAH * .80 ) / 50 hrs = X
X = 120 mA current draw

Even taking out the .80 fudge factor since the low current draw improves efficiency we're still only talking 150 mA draw.  Seems awfully low.  Hmmmmm...what's going on here...can the NJB3 really draw so little current while recording?!?

Alex, did you run a digital signal into the NJB3 this whole time?

Also looks like you got pretty darn close to the theoretical max record space, ~30 hrs - any artifacts in the recordings?

[Swampy]

okay, so this sucker finally ran out... It got about 50 hours on a 7.5ah batt. So if my calculations are correct:

Battery mAh (7.5) times current draw (x) times .80 = run time (50)

So that would make x=8.3... So the JB3 current draw is 8.3 according to my calculations. Does this sound right? I hope I did it right!

Not quite.  Your initial equation is wrong: should divide battery mAH by current draw, not multiply.  And 7.5 is the batt capacity in AH, not mAH - should be 7500 mAH:

( battery capacity / current draw ) * .80 = estimated run-time
( 7500 mAH / X ) * .80 = 50 hrs
( 7500 mAH ) * .80 = 50 hrs * X
( 7500 mAH * .80 ) / 50 hrs = X
X = 120 mA current draw

Even taking out the .80 fudge factor since the low current draw improves efficiency we're still only talking 150 mA draw.  Seems awfully low.  Hmmmmm...what's going on here...can the NJB3 really draw so little current while recording?!?

Alex, did you run a digital signal into the NJB3 this whole time?

Also looks like you got pretty darn close to the theoretical max record space, ~30 hrs - any artifacts in the recordings?

Thanks man! I gave it a analog signal, maybe I should try it with a digital signal... It seemed like it ran forever....

[Brian Skalinder]

Hmmmmmm...if anything, I would expect running analog-in would use even more juice.  Very interesting, thanks for running the test, Alex!

[Swampy]

As soon as the batt gets charged up, Ill run a digi signal in... Should I run my pre  > HOsa >  jb3? Or can I just run the hosa into it?

[dklein]

I'll betcha you were recording in the default mp3 format.   I was following this post and wondering what was going on...no heat from the regulator, crazy battery life - your JB3 wasn't sucking like it should.

Try again recording in wave format - the drive spins waaaay more!  

I don't think it will go more than 3 hours on it's own.  You'll have to be there to press the forward button and start a new 3 hour track.  If you have a 7.5Ah battery you'll probably go 12 hours.

Be sure to turn the IR off - mine has popped back on occasionally (maybe if I pull the battery for a reset?)

[Swampy]

I was recoding in wave, Im not that careless! Why do you need to push FF if its recording in continuous mode? IR was off.

[F.O.Bean]

you dont alex, i dont think he knew you were running "continuous"

no need to push FF in that mode, cause a new one is automatically!!!

when i get my 12v setup going, i will run a signal from mics>v3 the whole time, to see whats really going on;-)

nice alex, thats alot of hrs

if it can go 27 hrs safely, i'll be happy, since i know i can get that out of the hosa batt, the 3 bp-50's will go 9 hrs a piece from the v3, and now the jb3 can go that long too? too fuggin cool!!!

also, it cant hold much more data than around 30 hrs anyway

[Brian Skalinder]

Hmmmm...curious, now.  I have an old 12v lying around somewhere, may have to give this one a go, too.  Nice work, Alex!