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Dual DC power supply

  1. Jan 14, 2012 #1
    Hi,i really need help on how to design a dual channel DC power supply that fulfills the following specifications :

    1) Operation - User selection between independent adjustment for positive and negative output voltage, and series tracking mode (slave channel tracks the master channel)

    2) Output voltage amplitude : 0-20V± 5%

    3) Current limit : 0 - 1.5A± 10%

    4) Powered Directly from main supply

    5) Indications of power on, constant voltage and constant current mode

    I really hope you guys will be able to help me and provide me with a schematic to achieve the above specifications..thanks in advance =)
     
  2. jcsd
  3. Jan 14, 2012 #2
    I have found the schematic from this link http://www.aaroncake.net/circuits/supply3.asp
    but i would like to know how to make the circuit to produce an output voltage of 0-20V instead of just 0-15v?can anyone give me any helpful suggestions?
     
  4. Jan 14, 2012 #3

    jim hardy

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    that schematic should produce from 1.2 to 27 volts.

    check datasheet for your regulator.
    http://www.ti.com/lit/ds/symlink/lm117.pdf

    EDIT make that "that schematic should produce from 1.2 to about 19 volts.

    what limits it to 19V is volts available from transformer.
    15 X sqr(2) = 21 volts, less drop across bridge.

    use a higher voltage transformer, something like this:
    http://www.allelectronics.com/make-a-store/item/TX-398/POWER-TRANSFORMER-39.8V/22.5V-2.25A/1.html [Broken]

    and you should do fine.
     
    Last edited by a moderator: May 5, 2017
  5. Jan 14, 2012 #4
    wow..thanks a lot..appreciate it =)
     
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