pls help 0-30 Vdc and 5v Fixed power supply

Discussion in 'Power Electronics' started by sgtadzs, Feb 20, 2007.

  1. sgtadzs

    Thread Starter New Member

    Feb 19, 2007
    2
    0
    good day! could anyone help me to construct a diagram/ circuit for a power supply with these specifications:
    - output voltage 1: ---- 5 Vdc fixed
    - output voltage 2: ---- 0-30 Vdc adjustable
    - output current: 3A (minimum)
    - full wave bridge rectifier
    - input AC voltage is 220 Vac

    please anyone... help me....
    thnks a lot
     
  2. lightingman

    Senior Member

    Apr 19, 2007
    374
    22
    Hi.For the 5 volt fixed @ 3 amps, the LM323 will probably do the trick (with large heatsink).For the 0 to 30 volt supply, use an LM338 (with large heatsink), it is adjustable from 1.25 to 30 volts, or from zero using a 1.2 volt -ve ref.Spec sheets should be available on the web.If you need more help or schematics, let me know...Daniel.
     
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