Power Supply 24v and 5v

Discussion in 'General Electronics Chat' started by pheonix992, May 16, 2014.

  1. pheonix992

    Thread Starter New Member

    Jun 23, 2013
    21
    0
    please i want a power supply circuit its input 220v ac
    and out 24v dc and 5v dc by using lm7824 and 7805
    i want a stable power supply because it will be connected with
    other appliance in home and there is high noise
     
  2. panic mode

    Senior Member

    Oct 10, 2011
    1,320
    304
    this is trivial, get transformer, bridge rectifier, filtering cap and two regulators.
    now for low voltage regulator do not use the good old linear 7805, get switching one because of required huge voltage drop. linears are terrible at this and dissipate tons of heat. if you do need compact solution that is pin compatible with 7805, use switcher such as 78sr05:
    http://www.murata-ps.com/data/power/oki-78sr.pdf
     
    absf likes this.
  3. MrChips

    Moderator

    Oct 2, 2009
    12,439
    3,360
    You are missing some important pieces of information.
    How much current do you need on the 24VDC and 5VDC supplies?
     
  4. pheonix992

    Thread Starter New Member

    Jun 23, 2013
    21
    0
    maximum 25 ma
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,439
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    25mA on which power supply line?
     
  6. pheonix992

    Thread Starter New Member

    Jun 23, 2013
    21
    0
    i want the 2 regulators in series
     
  7. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
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