Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: 3A 12v regulator?

  1. #1
    Variable Bitrate
    Join Date
    Sep 2004
    Posts
    440

    3A 12v regulator?

    If I can find plans or make plans for a 3A 12v regulator that will work from 9-18v input that would be great. The idea is to use a mini itx mother board + the pw-120-m. Sence the mini itx mobo dosnt use the 12v rail then I don't need to worie about that part. I just need a small 12v regulator so I can use full size hard drive and cd rom. I'm planing on puting the 12v regulator after the pw-120-m. So if any one has any plans that would be super great.

  2. #2
    ptk
    ptk is offline
    Variable Bitrate
    Join Date
    Apr 2004
    Location
    Singapore
    Posts
    333
    Quote Originally Posted by hcker2000
    If I can find plans or make plans for a 3A 12v regulator that will work from 9-18v input that would be great. The idea is to use a mini itx mother board + the pw-120-m. Sence the mini itx mobo dosnt use the 12v rail then I don't need to worie about that part. I just need a small 12v regulator so I can use full size hard drive and cd rom. I'm planing on puting the 12v regulator after the pw-120-m. So if any one has any plans that would be super great.
    see if you can find 3 pieces of the UM2702 (Universal Microelectronics)
    http://www.umec-web.net/

    each puts out about 1.25A. it retails for 18 SGD (about 10USD) each in singapore.

    that's the easiers way for me so far. I used it to power devices that are too far from the PSU to be run the power cable. I hacked the USB cable to run 12V through it (on both end) and run one of these babies to give me instant 12V & 5V. 5V sees too much drop when you run it through long USB cables.

    kao
    ***
    CarPC Ver 4 completed. Aopen i45GMT-HD, C2D mobile 2GHz. Photofast 64GB SSD. Novatel EU-850D

  3. #3
    Variable Bitrate
    Join Date
    Sep 2004
    Posts
    440
    Thanks for the info I'll keep those in mind. I'm hoping I can find a solution with a total cost of around $15 or so. Basicly just need enough to run a full size cd rom and hard drive.

  4. #4
    Maximum Bitrate starfox's Avatar
    Join Date
    May 2002
    Location
    Australia
    Posts
    451
    Natsemi has this nice IC.

    http://www.national.com/pf/LM/LM1084.html

    I've used them a couple of times, nice and easy and do up to 5A (a bit more if you heatsink them well). 1.3V drop out. A bit expensive to buy in small quantities, but they ship free samples to many countries.

  5. #5
    Low Bitrate
    Join Date
    Sep 2004
    Location
    Denmark
    Posts
    57
    ... or combine 2 pcs. of 7812s (the S is for 2A) ... they cost next to nothing

  6. #6
    Variable Bitrate
    Join Date
    Sep 2004
    Posts
    440
    Ok will LM1084 be able to out put 12v if the input falls below 12v?

  7. #7
    Variable Bitrate
    Join Date
    Apr 2004
    Posts
    228
    No it won't. If people would read what others have posted rather than jumping at the chance to be a hero and offer what they think is great advice it would save a lot of trouble.

    What you want to do plenty of people are trying to work on. Regulating the 12V line in a car environment isn't easy and it won't be easy for you if you don't have more than basic knowledge of circuits.

  8. #8
    Maximum Bitrate starfox's Avatar
    Join Date
    May 2002
    Location
    Australia
    Posts
    451
    Ah sorry i missed the 9-18V bit, thought he just wanted a 12V post regulator.

  9. #9
    Variable Bitrate
    Join Date
    Jun 2003
    Location
    Chicago
    Posts
    384
    use two TI PT5071 regulators with the outputs connected in parallel via schottkey diodes. I use four of these in parallel and it has worked great for almost two years.

  10. #10
    Variable Bitrate
    Join Date
    Sep 2004
    Posts
    440
    EBJUSTIN: dose it work when the car is runing and when the car is off? Also how many amp can it handle? and do you have a quick layout of the components?

Page 1 of 2 12 LastLast

Similar Threads

  1. 12v regulator to suit morex 2677?
    By abitcrazy in forum Power Supplies
    Replies: 1
    Last Post: 08-22-2004, 12:33 AM
  2. 12v 1.5A in parallel produce 12v 3A
    By danon in forum Power Supplies
    Replies: 15
    Last Post: 01-22-2004, 12:36 PM
  3. Tutorial on how to install Regulator for 12v?
    By e36mp3 in forum Power Supplies
    Replies: 5
    Last Post: 07-05-2003, 09:14 AM
  4. 12v voltage regulator
    By masch in forum Power Supplies
    Replies: 2
    Last Post: 04-11-2003, 02:51 PM
  5. 12v 5a regulator for cheap?
    By Spongebob in forum Power Supplies
    Replies: 5
    Last Post: 02-19-2003, 09:12 AM

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
  •