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Author Topic: JB3 external power  (Read 61224 times)

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Offline fozzy

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Re:JB3 external power
« Reply #195 on: April 12, 2004, 04:21:38 PM »
damn this sucker is heavy.  Does it come charged or do i need to charge it?
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Offline recordista

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Re:JB3 external power
« Reply #196 on: April 12, 2004, 05:15:14 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?

http://www-s.ti.com/sc/ds/pt78ht205.pdf is your friend.

Offline recordista

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Re:JB3 external power
« Reply #197 on: April 12, 2004, 05:33:41 PM »
http://www-s.ti.com/sc/ds/pt78ht205.pdf is your friend.

Should have mentioned that I found a really cool 100 µF cap for this, miniscule size with excellent HF performance.  It's a surface mount device but easy to attach directly on the PT78HT205 with a couple of clipped leads and an iron.  DigiKey p/n 399-3054-1-ND

Might also want to add a PTC in series with the battery lead if your battery packs don't already have these in them.

Offline Brian Skalinder

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Re:JB3 external power
« Reply #198 on: April 12, 2004, 06:01:05 PM »
Duh.  Thanks, recordista, should've checked the manufacturer's spec sheets.  If I do it, I'm definitely gonna PTC fuse the sucker to be safe.

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Offline drewloo

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Re:JB3 external power
« Reply #199 on: April 12, 2004, 11:28:20 PM »
damn this sucker is heavy.  Does it come charged or do i need to charge it?
It should be mostly charged.  Storing SLA's less than fully charged is bad for the battery, but it's rare to get a completely charged one off the shelf.


Offline fozzy

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Re:JB3 external power
« Reply #200 on: April 13, 2004, 12:40:05 AM »
whats up drew.  yea it is charging my jb3 right now w/ it's charge, had to murder the Creative ac adapter because i am impatient.  I am assuming the SLA should drain completely before charging.  I generally plug in a series of 12v automotive batteries for this.  Also picked up something similar to what you got for the JB3 power inverter from radio shack.  Will be making another trip tomorrow to grab up the adapter for the UA5 and the makings to repair my AC adapter.

I also got the ~$12 wall wart charger Altex had pretty sure it is not "smart".  The only other one they had were the fancy ~$45 ones.  I also stocked up on RCA barrels and other adapters, very cheap.

Let me know if you guys want some pictures and i'll snap a few.  
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Offline F.O.Bean

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Re:JB3 external power
« Reply #201 on: April 13, 2004, 07:39:05 AM »
whats up drew.  yea it is charging my jb3 right now w/ it's charge, had to murder the Creative ac adapter because i am impatient.  I am assuming the SLA should drain completely before charging.  I generally plug in a series of 12v automotive batteries for this.  Also picked up something similar to what you got for the JB3 power inverter from radio shack.  Will be making another trip tomorrow to grab up the adapter for the UA5 and the makings to repair my AC adapter.

I also got the ~$12 wall wart charger Altex had pretty sure it is not "smart".  The only other one they had were the fancy ~$45 ones.  I also stocked up on RCA barrels and other adapters, very cheap.

Let me know if you guys want some pictures and i'll snap a few.  

i would love to see more pictures of this!!
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Offline drewloo

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Re:JB3 external power
« Reply #202 on: April 13, 2004, 09:28:32 PM »
A buddy of mine who tapes was wanting to market those puppies towards the taping crowd.  He used one for his M1 also and said it ran it for a real long time.

Offline Sterling

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Re:JB3 external power
« Reply #203 on: April 13, 2004, 11:01:20 PM »
Hmm nice work Swampy, Bean and keep us posted Brian. I have two 12V's here got a little hasty when this all started, I got em cheap though ;D). Anyway, I'm gonna go get the adaptor adn hack thes up for some tests int he next week or so adn I'll post...with pics.

Sterling

Offline Swampy

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Re:JB3 external power
« Reply #204 on: April 13, 2004, 11:07:11 PM »
Im running my whole rig now... Testing the JB3... Almost 16 hours strong on the JB3...
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Offline Ed.

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Re:JB3 external power
« Reply #205 on: April 14, 2004, 02:19:36 AM »
damn, i don't know if i should spend the money and buy all of this or what.  i hate being poor.


Because nothing says "I have lots of money and am sort of confused as to how to spend it" like Bose.

Offline F.O.Bean

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Re:JB3 external power
« Reply #206 on: April 14, 2004, 05:07:14 AM »
haha, go for it ed

alex, NICE, thats all i can say is NICe

also, how long does dmic last on one 6v???i never tested that, cause i always ran my d-8 too
Schoeps MK 4V & MK 41V ->
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Sound Devices MixPre-6 & MixPre-3 ->
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Offline Swampy

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Re:JB3 external power
« Reply #207 on: April 14, 2004, 09:29:50 AM »
Hey, when I left for school, the JB3 had been running for 24 hours!!! Ill let you know if its still running after school. The DMIC has pretty good run time, my smallest battery will run it for 7 hours and my others upwards of 9! Ive been swiching them out for the tests so the DMIC keeps going! I think the hosa battery will probably die before the JB3 though... :'(
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Offline F.O.Bean

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Re:JB3 external power
« Reply #208 on: April 14, 2004, 09:42:34 AM »
Hey, when I left for school, the JB3 had been running for 24 hours!!! Ill let you know if its still running after school. The DMIC has pretty good run time, my smallest battery will run it for 7 hours and my others upwards of 9! Ive been swiching them out for the tests so the DMIC keeps going! I think the hosa battery will probably die before the JB3 though... :'(

WOW :o

that is sooooo cool alex, if it reaches 27-30 hrs, im so set!! ;D
Schoeps MK 4V & MK 41V ->
Schoeps 250/0 KCY's (x2) ->
Naiant +60v/Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3 ->
SanDisk 128gb Extreme Pro & 64gb Ultra Plus SDXC-I

http://www.archive.org/bookmarks/diskobean
http://www.archive.org/bookmarks/Bean420
http://bt.etree.org/mytorrents.php
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Offline Sterling

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Re:JB3 external power
« Reply #209 on: April 14, 2004, 02:24:16 PM »
Yeah..if it goes that long I won't need the other 12V so I'll put it up for grads cheap...lets see...although maybe I could use it to keep the ua5 rockin'... :hmmm:
thats alot of weight though...IDK we'll see. Thanks for the test though swampy.

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