Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

FS: Jibs Linear Drivers

jib77

jib77

0
Joined
Jun 19, 2010
Messages
718
Points
0
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! :D
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).
 
Last edited:





S

SpyderFire

0
Joined
May 27, 2010
Messages
423
Points
0
Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

What is an example of a "IMR/LowR Cell" ?
 
jib77

jib77

0
Joined
Jun 19, 2010
Messages
718
Points
0
Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

SpyderFire said:
What is an example of a "IMR/LowR Cell" ?
Click to expand...

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-IMR18650-1600mAh-LiMN-rechargeable-lithium-battery_p_2797.html, My favorite: http://leddna.com/imr26650-limn-lithium-38v-4000mah-rechargable-battery_p303.html.
 
Last edited:
steviedezie

steviedezie

0
Joined
Dec 23, 2010
Messages
561
Points
0
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?
 
Last edited:
B

bhwollen

0
Joined
Jan 13, 2011
Messages
1,681
Points
0
Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

My guess is the resistor side steve.
 
xivlia

xivlia

0
Joined
Mar 20, 2011
Messages
173
Points
18
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.
 
jib77

jib77

0
Joined
Jun 19, 2010
Messages
718
Points
0
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.
 
B

bhwollen

0
Joined
Jan 13, 2011
Messages
1,681
Points
0
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...
 
xivlia

xivlia

0
Joined
Mar 20, 2011
Messages
173
Points
18
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 :D oh well never mind :D
 
jib77

jib77

0
Joined
Jun 19, 2010
Messages
718
Points
0
Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

xivlia said:
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 :D oh well never mind :D
Click to expand...

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.
 
xivlia

xivlia

0
Joined
Mar 20, 2011
Messages
173
Points
18
Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

ahh, that makes better sense :D
 
steviedezie

steviedezie

0
Joined
Dec 23, 2010
Messages
561
Points
0
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.
 
xivlia

xivlia

0
Joined
Mar 20, 2011
Messages
173
Points
18
Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

untill the batteries run out :D
 
jib77

jib77

0
Joined
Jun 19, 2010
Messages
718
Points
0
Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

jib77 said:
BTW I found a promising boost chip that can theoretically go up to 3.5A! :D
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).
Click to expand...

Layout complete: :san:

5230-jibboost.png
 
LaZeRz

LaZeRz

0
Joined
Feb 19, 2011
Messages
2,549
Points
63
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 :D

+2 :p

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
 
Last edited:
You must log in or register to reply here.





Top