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Old 05-02-2011, 06:13 AM #385
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

BTW I found a promising boost chip that can theoretically go up to 3.5A!
Im currently working on layout for a prototype ... if all goes well it will be a sub $20 driver. The only drawback is this will not be a continuous ground driver, so it can not be used for any diodes that have a common node with its case(like reds).


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Last edited by jib77; 05-06-2011 at 06:11 AM.
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Old 05-02-2011, 06:46 AM #386
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

What is an example of a "IMR/LowR Cell" ?
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Old 05-02-2011, 07:00 AM #387
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Quote:
Originally Posted by SpyderFire View Post
What is an example of a "IMR/LowR Cell" ?
Low resistance cells. Because they have very low internal resistance they can supply the current necessary to drive these high current builds.

LarryDFW's 18650's are LowR cells, AW IMR: http://www.lighthound.com/AW-IMR1865...ry_p_2797.html, My favorite: http://leddna.com/imr26650-limn-lith...tery_p303.html.
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Last edited by jib77; 05-02-2011 at 07:03 AM.
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Old 05-03-2011, 05:12 PM #388
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Hey Jibs, if you had the choice to only heatsink 1 side of the driver, which side should be heatsinked?

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Old 05-03-2011, 05:19 PM #389
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

My guess is the resistor side steve.
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Old 05-03-2011, 05:31 PM #390
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

i think the regulator side..the resistors doesnt seem to get too hot with my custom made driver..but the regulator is almost impossible to touch due to heat.
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Old 05-03-2011, 05:43 PM #391
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Resistor side because the copper under the resistors act as the thermal tab for the regulator (just like the metal tab on a TO-220 LM317). I like to push the thermal adhesive into the spaces between and around the resistors.
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Old 05-03-2011, 05:46 PM #392
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

I was right! lol

But in my experience these don't even need heatsinking...
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Old 05-03-2011, 06:28 PM #393
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

hmmm. thats weird. my regulator gets very very hot. a tiny thin peice of copper wont cool it down at all in my experiance. maybe because mine is a voltage regulator thats why oh well never mind
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Old 05-03-2011, 06:57 PM #394
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

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hmmm. thats weird. my regulator gets very very hot. a tiny thin peice of copper wont cool it down at all in my experiance. maybe because mine is a voltage regulator thats why oh well never mind
Well its two pieces of copper, one over most of the top layer and another over most of the bottom layer tied together with a bunch of vias. This is a decent amount of mass and surface area for the heat to dissipate from the chip.
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Old 05-03-2011, 08:52 PM #395
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

ahh, that makes better sense
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Old 05-03-2011, 09:02 PM #396
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

ok got it. Thanks for all the input. I have no idea how the internal copper traces work in your driver. Now it all makes sense... Im hoping to get unlimited duty cycle with a guidesman 2 host + driver heatsink.
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Old 05-03-2011, 10:14 PM #397
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

untill the batteries run out
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Old 05-06-2011, 06:10 AM #398
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Quote:
Originally Posted by jib77 View Post
BTW I found a promising boost chip that can theoretically go up to 3.5A!
Im currently working on layout for a prototype ... if all goes well it will be a sub $20 driver. The only drawback is this will not be a continuous ground driver, so it can not be used for any diodes that have a common node with its case(like reds).
Layout complete:

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FS - My cheap LM1117 driver: >>LINK<<

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Old 05-06-2011, 10:57 AM #399
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

niiiiiiceee
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Old 05-06-2011, 11:17 AM #400
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Default Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Just wanna say Thanks Rick! i finally got around to finishing my LOC hotlight, i've been walking around the house smoking crap

+2

gonna post a little tut thingy but the problem is people will ahve to bear with my recently wrecked sony camera, the focus is messed up....

LOL BHWOLLEN... 1000+ posts already
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