Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 21

Thread: Good designs for 12v to 19v/3.5A for powering laptops

  1. #11
    Variable Bitrate
    Join Date
    Nov 2005
    Posts
    264
    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

  2. #12
    Newbie CanuckMark's Avatar
    Join Date
    Feb 2009
    Location
    Orillia, Ontario, Canada
    Posts
    33
    Quote Originally Posted by PhilG View Post
    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.

  3. #13
    FLAC PhilG's Avatar
    Join Date
    Mar 2009
    Location
    Ontario, Canada
    Posts
    1,005
    Quote Originally Posted by upspace View Post
    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.

  4. #14
    FLAC PhilG's Avatar
    Join Date
    Mar 2009
    Location
    Ontario, Canada
    Posts
    1,005
    Quote Originally Posted by CanuckMark View Post
    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!

  5. #15
    Variable Bitrate
    Join Date
    Nov 2005
    Posts
    264
    yes it is the p1900. shipping to canada is possible (i am in switzerland) and costs are approx. 30-35$ so in total 50$.

  6. #16
    FLAC PhilG's Avatar
    Join Date
    Mar 2009
    Location
    Ontario, Canada
    Posts
    1,005
    Quote Originally Posted by upspace View Post
    yes it is the p1900. shipping to canada is possible (i am in switzerland) and costs are approx. 30-35$ so in total 50$.
    I am interested. Is it a version 2.2?
    How would we do the transaction, Paypal? I guess this would require "a leap of faith" on my part? Can the package be insured and have a tracking number?
    Thanks!

  7. #17
    Constant Bitrate sergatiuk's Avatar
    Join Date
    Mar 2006
    Posts
    198
    i think http://www.mini-box.com/DCDC-USB is your best option
    ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
    2007 Toyota Tundra Double Cab SR5
    >"Say what you mean and mean what you say"<

  8. #18
    FLAC PhilG's Avatar
    Join Date
    Mar 2009
    Location
    Ontario, Canada
    Posts
    1,005
    Quote Originally Posted by sergatiuk View Post
    i think http://www.mini-box.com/DCDC-USB is your best option
    Thank you for the heads up on this PS. I will investigate this option as well. It's well priced and has a USB output without an add on component that the Carnetix requires. I presume I can hack this one into the power switch of a laptop just like the Carnetix?
    I just Emailed them to ask if they would ship USPS as UPS is BRUTAL for cost to ship to Canada.

  9. #19
    FLAC PhilG's Avatar
    Join Date
    Mar 2009
    Location
    Ontario, Canada
    Posts
    1,005
    duplicate message

  10. #20
    Newbie 2Wheeler's Avatar
    Join Date
    Jul 2011
    Location
    Florida USA
    Posts
    22
    I know this page has been brought back from the grave once, but I found it relevant in 2011. If anyone wants the English version of the schematic & parts list on page 1, it's here:
    Laptop Power Supply Adapter 95W

Page 2 of 3 FirstFirst 123 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •