Using ATX PSU to get voltages in between 3.3, 5v and 12v for 7v, 8.7v & 1.7v

Discussion in 'General Electronics Chat' started by RogueRose, May 17, 2016.

  1. RogueRose

    Thread Starter Member

    Oct 10, 2014
    188
    4
    I read somewhere that I could use the 5v rail and the 12v rail to get a 7v supply. I tried connecting my motor to the 12v & 5v supplies and nothing happened. I tried switching the connections on the motor to see if it was polarity, but it wasn't. Is what I'm trying to do possible and if so what do I have to do to get this working?
     
  2. nigelwright7557

    Senior Member

    May 10, 2008
    487
    71
    You would need to tie together 12v zero volt line and 5 volt zero line.
     
  3. paulktreg

    Distinguished Member

    Jun 2, 2008
    609
    120
    The 0V rails are already all tied together.

    Have you switched the power supply on by shorting the green wire on the 20 (might be 24) pin connector to 0V?

    If this doesn't do it the power supply may need a load. An HDD or two would do.
     
  4. RogueRose

    Thread Starter Member

    Oct 10, 2014
    188
    4

    IDK, it is working with regular 12, 5 and 3.3 rails, just not when I use "non-standard" rails like 12 & 5v together.. I'll try running something on the 12v & ground adn then also trying something with the 12v & 5v together.
     
  5. RogueRose

    Thread Starter Member

    Oct 10, 2014
    188
    4
    What does that mean? Are they specific wires or something?
     
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