Newbie need help - 741 non inverting amplifier

Discussion in 'The Projects Forum' started by ReVl27, Apr 1, 2012.

  1. ReVl27

    Thread Starter New Member

    Mar 18, 2012
    3
    0
    I got a 741 and a few resistor.
    I have +3V, +12V and ground legs from the PC mother board.
    Now I want to create an output of +9V with the 741.
    Would you please help me with this circuit???
    Thanks a lot!!!!
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,154
    3,061
    Easy. Lose the 741 and measure the voltage across the +12 and the +3. Should be 9V. Done.

    But to get serious, you need to provide more information about what you would like to do; how much current, are we talking DC? An op-amp doesn't create power - it just amplifies tiny signals to larger - but still small - signals.
     
  3. ReVl27

    Thread Starter New Member

    Mar 18, 2012
    3
    0
    Well...yes, we are talking about DC.
    I made a breathing (fading) LED circuit for my PC power LED indicator.
    But it requires 9V to supply for that circuit (555 IC, 2 capacitor, LED....).
    So the +3V of the power LED leg on the mother board is not enough.
    Though, the mother board consists of a few +12V leg for cooling fan.
    So on the motherboard, i got +3V, +12V, (+5V : USB also) and ground.
    I need to create an +9V leg to supply the breathing LED circuit.
    So please help me with the most simple solution.
     
    Last edited: Apr 1, 2012
  4. #12

    Expert

    Nov 30, 2010
    16,345
    6,831
    Post the schematic and we'll tell you which resistors to change...if any.
     
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