0-30 V dc variable supply without using transistors

Discussion in 'The Projects Forum' started by abdullah8391, Sep 8, 2015.

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  1. abdullah8391

    Thread Starter Member

    Sep 6, 2015
    53
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    HI everyone, this is my first post so i am expecting a lot from this forum (basically also my first time asking for help on a forum).

    I am given a project to design a dc power supply with
    1. centre-tape transformer (220-V AC to 24*2 V AC).
    2. LM-317 ic.

    I can't use any transistors or any other ic's, so can anyone give me some ideas on how to do it?

    my design works from 1.25-30 volts DC. But i couldn't understand how to drop those 1.25 to 0. since Vout=1.25*(1+R2/R1).
     
  2. be80be

    Senior Member

    Jul 5, 2008
    431
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    You'll not get much help cross posting.
     
  3. abdullah8391

    Thread Starter Member

    Sep 6, 2015
    53
    1
    sorry, i wrote it in wrong place, but didn't knew how to delete it...
    sorry again... :-(
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,647
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