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08-27-2004, 09:17 PM
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#1
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Newbie
Join Date: Aug 2004
Location: Serbia
Posts: 7
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Good designs for 12v to 19v/3.5A for powering laptops
With ground loop and stuff.
I have seen post adress this but nothing definite
so it would be nice to get a straight answer...
The schematics that does the job right...
Thanks....
** here it is rewritten, heh **
Last edited by Enforcer; 09-09-2009 at 02:26 PM.
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08-27-2004, 09:19 PM
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#2
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Low Bitrate
Join Date: Aug 2004
Location: New Zealand
Posts: 56
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Heh, I never knew god designed methods for powering laptops :P
Last edited by MikeXP; 08-27-2004 at 09:23 PM.
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08-27-2004, 09:23 PM
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#3
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Maximum Bitrate
Join Date: Aug 2004
Location: California
Posts: 599
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That would be one damn good design if god designed it. 
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08-27-2004, 11:05 PM
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#5
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Newbie
Join Date: Aug 2004
Location: Serbia
Posts: 7
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There is not much choice,
I can not buy on line, my country will not
allow this. I can not fina an adapter in my country.
And leaving the country to buy an adapter is a bit
extreme, heh...
So i will make it myself...
Webench is nice, but i was thinking more in
line of working/prowen designes that i would just
copy/make... If there is any...
Thanks a lot...
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03-16-2009, 10:49 PM
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#6
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Newbie
Join Date: Mar 2009
Posts: 2
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Good Schematic
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03-19-2009, 05:02 PM
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#7
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Low Bitrate
Join Date: Sep 2008
Location: VA
Posts: 88
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post #1: a 5 year bump. nice lol
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03-19-2009, 08:16 PM
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#8
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Constant Bitrate
Join Date: May 2008
Posts: 186
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Man, I just got a good lol, not just from the title, but the 5 year bump deal!  
__________________
Kids, don't play with too many knives! -Crack Stuntman
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09-09-2009, 02:09 PM
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#9
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Newbie
Join Date: Feb 2009
Location: Orillia, Ontario, Canada
Posts: 6
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Quote: Originally Posted by m0r473n53  Good Schematic
I know this is an old post, but I wanted to provide some feedback on the circuit in this post ( PDF). I have built it and it works very well. It is currently running a AAO and current conversion is very efficient, almost no heat whatsoever.
The text isn't in english and the image quality is poor, but there is one error in the parts list: R9 and R10 are specified as 6.8 kohm where they should be 6.8 ohm, the schematic is correct. Otherwise it worked perfectly. Constant draw is 5A with 10A intermittent, and voltage is adjustable.
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09-29-2009, 08:07 PM
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#10
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Newbie
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 27
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CanuckMart, where did you get your components from and what was the total cost if you don't mind me asking? I might take a run at building this instead of shelling out 150 for a Carnetix. Thanks!
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10-01-2009, 04:11 AM
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#11
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Variable Bitrate
Join Date: Nov 2005
Posts: 238
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Hi PhilG
I have used such an Carnetix for laptop powering in the past. Now I have an Archos for my car.
You can have it for 20$ (plus shipping costs) if you are interested
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10-01-2009, 09:13 PM
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#12
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Newbie
Join Date: Feb 2009
Location: Orillia, Ontario, Canada
Posts: 6
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Quote: Originally Posted by PhilG CanuckMart, where did you get your components from and what was the total cost if you don't mind me asking? I might take a run at building this instead of shelling out 150 for a Carnetix. Thanks!
In all honesty it wasn't cheap (all from Digikey), but it was an experiment that I was working on anyway.  I can't recall the exact total cost as the parts were in a larger order with other stuff.
There is an update on this - I had significant ground loop noise issues. Granted it was not the final install (just a test rig for the moment), but the common ground in this design caused a loop issue severe enough to make me rethink the final design. Final wiring would address ground resistance issues on the analog audio side but not on internal computer/USB losses. This is where the inverter/transformer setup has an advantage as it breaks that ground loop - that will probably be the final design in my rig.
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10-02-2009, 04:26 PM
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#13
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Newbie
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 27
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Quote: Originally Posted by upspace Hi PhilG
I have used such an Carnetix for laptop powering in the past. Now I have an Archos for my car.
You can have it for 20$ (plus shipping costs) if you are interested
Thank you for the offer, upspace, but you are not in North America, correct? If thats the case, can it be shipped reliably to Canada at a reasonable expense? Is it the P1900?
Thanks.
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10-02-2009, 04:30 PM
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#14
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Newbie
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 27
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Quote: Originally Posted by CanuckMark In all honesty it wasn't cheap (all from Digikey), but it was an experiment that I was working on anyway. I can't recall the exact total cost as the parts were in a larger order with other stuff.
There is an update on this - I had significant ground loop noise issues. Granted it was not the final install (just a test rig for the moment), but the common ground in this design caused a loop issue severe enough to make me rethink the final design. Final wiring would address ground resistance issues on the analog audio side but not on internal computer/USB losses. This is where the inverter/transformer setup has an advantage as it breaks that ground loop - that will probably be the final design in my rig.
Thank you for the answer on this CanuckMark, I guess prefab will be the way to go for me, I do have the ability to assemble but not design or modify design. It sounds like you have the ability to isolate the ground issue and redesign if necessary, good luck with it!
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10-03-2009, 05:36 AM
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#15
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Variable Bitrate
Join Date: Nov 2005
Posts: 238
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yes it is the p1900. shipping to canada is possible (i am in switzerland) and costs are approx. 30-35$ so in total 50$.
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