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Author Topic: JB3 external power  (Read 229,138 times)

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Offline F.O.Bean

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Re:JB3 external power
« Reply #180 on: April 12, 2004, 07:58:37 AM »
please do brian;-)

i prolly wont have my 12v plus car kit for a month at least, but if you dont do it, i'll give it a go asap!!!
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Offline Brian Skalinder

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Re:JB3 external power
« Reply #181 on: April 12, 2004, 08:05:51 AM »
Oh!  And Alex, it isn't that I don't trust your testing, I just wanna give it a go myself before festival season hits (control freak, you see).   :)

Still deciding which way to go: 4 x 8AH D-cell rechargables (since I already have two sets of four) or 12v SLA.  Prolly will try both before festival season ramps up for me.
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Offline Swampy

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Re:JB3 external power
« Reply #182 on: April 12, 2004, 08:41:58 AM »
Ill start my real tests after school. WHOLE rig running! Im sure we'll get a much more accurate picture of the JB3s draw!
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Offline F.O.Bean

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Re:JB3 external power
« Reply #183 on: April 12, 2004, 08:50:59 AM »
yeah, thats what im thinking too alex, but damn 50 hrs is a GREAT sign
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Offline Brian Skalinder

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Re:JB3 external power
« Reply #184 on: April 12, 2004, 09:38:36 AM »
Quote from: Alex "swampy" Herd on April 12, 2004, 08:41:58 AM
Ill start my real tests after school. WHOLE rig running! Im sure we'll get a much more accurate picture of the JB3s draw!

As long as you're feeding it a digital signal (assuming that's how you normally run), it shouldn't matter whether you're running full rig or PC digi-out > ODL > JB3.  Right about now I'm wishing I had an AES/EBU output on my soundcard (or a -276 dfc) so I didn't have to power my V3 the whole damn time during my tests!
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Offline F.O.Bean

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Re:JB3 external power
« Reply #185 on: April 12, 2004, 10:02:33 AM »
ha, i have the 276 but no digi soundcard
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Offline gruven42

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Re:JB3 external power
« Reply #186 on: April 12, 2004, 11:46:29 AM »
Hey guys, I just posted a topic about a product that allows you to avoid taking apart the Car Adapter:

http://www.taperssection.com/yabbse/index.php?board=25;action=display;threadid=17050
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Offline gruven42

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Re:JB3 external power
« Reply #187 on: April 12, 2004, 11:55:48 AM »
Quote from: Brian Skalinder on April 11, 2004, 04:23:50 PM
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?!?

So, now the JB3 draws 150? Wow, from a full amp to .15? Who's got a multi-meter?
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Offline Swampy

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Re:JB3 external power
« Reply #188 on: April 12, 2004, 12:39:35 PM »
Quote from: gruven42 on April 12, 2004, 11:55:48 AM
Quote from: Brian Skalinder on April 11, 2004, 04:23:50 PM
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?!?

So, now the JB3 draws 150? Wow, from a full amp to .15? Who's got a multi-meter?

No, thats all wrong. Im starting a real test tonight, digi signal in. Ill let everyone know the results.
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Offline fozzy

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Re:JB3 external power
« Reply #189 on: April 12, 2004, 12:51:32 PM »
just to clarify.  are you running  

JB3 (w/ 2 internal batts)> Creative Brand Car Adapter> some hacked cable > 12v 7.2ah SLA



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Offline recordista

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Re:JB3 external power
« Reply #190 on: April 12, 2004, 12:53:28 PM »
A TI PT78HT205 and a couple of caps will get you regulated +5V at 2A with a huge input range of 9-28 VDC.  Total parts cost is under $20 from DigiKey even in single unit quantities.  Wastes less power than a 7805, too...
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Offline Swampy

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Re:JB3 external power
« Reply #191 on: April 12, 2004, 01:01:10 PM »
Quote from: fozzy on April 12, 2004, 12:51:32 PM
just to clarify.  are you running  

JB3 (w/ 2 internal batts)> Creative Brand Car Adapter> some hacked cable > 12v 7.2ah SLA


JB3 (w/ 2 internal batts) > Creative Brand Car Adapter> some hacked cable > 12v 7.2ah SLA

You just hack off the cigerette adaptor and solder a 4 pin in its place
« Last Edit: April 12, 2004, 01:02:18 PM by Alex "swampy" Herd »
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Offline Swampy

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Re:JB3 external power
« Reply #192 on: April 12, 2004, 01:03:01 PM »
Quote from: Brian Skalinder on April 12, 2004, 08:05:51 AM
Oh!  And Alex, it isn't that I don't trust your testing, I just wanna give it a go myself before festival season hits (control freak, you see).   :)

No its cool, I should have tested it with digital signal...
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Offline Brian Skalinder

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Re:JB3 external power
« Reply #193 on: April 12, 2004, 01:12:54 PM »
Quote from: recordista on April 12, 2004, 12:53:28 PM
A TI PT78HT205 and a couple of caps will get you regulated +5V at 2A with a huge input range of 9-28 VDC.  Total parts cost is under $20 from DigiKey even in single unit quantities.  Wastes less power than a 7805, too...

Hmmmmm...very, very interesting.  So...for those comfortable with our soldering skills (but not terribly knowledgable about schematics and such - e.g., don't know what a "cap" is), what would this schematic look like, exactly?
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Offline fozzy

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Re:JB3 external power
« Reply #194 on: April 12, 2004, 01:48:18 PM »
Quote from: Alex "swampy" Herd on April 12, 2004, 01:01:10 PM
Quote from: fozzy on April 12, 2004, 12:51:32 PM
just to clarify.  are you running  

JB3 (w/ 2 internal batts)> Creative Brand Car Adapter> some hacked cable > 12v 7.2ah SLA


JB3 (w/ 2 internal batts) > Creative Brand Car Adapter> some hacked cable > 12v 7.2ah SLA

You just hack off the cigerette adaptor and solder a 4 pin in its place

cool, so no internals at all.  i think i am going to go grab a SLA at lunch. i have a show a night 4/26-4/29 i'd like to do w/o re-charging at all.  will be powering my both the ua5 and jb3.
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