Connect with us

7912 as negative voltage regulator issue

Discussion in 'General Electronics Discussion' started by Kaash, Aug 16, 2013.

Scroll to continue with content
  1. Kaash

    Kaash

    10
    0
    Aug 16, 2013
    hi guys..
    im using 7912 as negative voltage regulator but when i connected it with 12v or 20v supply it got very hot without any output voltage.
    i wasted 4-5 regulators but get no output -12, is there other any way to connect it?
    help plz.
    thanks

    79xx Pin Out and Application Circuit.jpg
     
  2. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    You have the ground and power reversed. For a negative regulator the ground has to be higher than the input.

    Edited: You also need the capacitors on the input and output. See the datasheet.

    Bob
     
    Last edited: Aug 16, 2013
  3. Kaash

    Kaash

    10
    0
    Aug 16, 2013
    will u recommend me capacitor's rating?
     
  4. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    Look up the datasheet. It has a sample circuit.

    Bob
     
  5. Kaash

    Kaash

    10
    0
    Aug 16, 2013
    ok thanks
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-