how to design regulated power supply with 0.00 to 10v

Discussion in 'The Projects Forum' started by bread, Aug 28, 2011.

  1. bread

    Thread Starter New Member

    Aug 28, 2011
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    can anybody suggest which ic regulator should i use instead of lm317?
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    What will be the needed current for this powersupply?

    The LM317 will not go lower as 1.25 Volts.

    Bertus
     
  3. iONic

    AAC Fanatic!

    Nov 16, 2007
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  4. SgtWookie

    Expert

    Jul 17, 2007
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    Why do you need voltages below ~1.3v? There isn't much of a call for voltages that low.
     
  5. #12

    Expert

    Nov 30, 2010
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    My favorite is the LM723 chip with both polarities of voltage supplied to it, and I don't give a rats' Sunday hat why you want to do it that way. The 723 is an old fashioned way to do it, but it's as versatile as you are.
     
  6. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    You could look through the LM317 datasheets, one datasheet I have seen has a circuit in there for using a second LM317 to provide the 1.25v offset and give a supply variable down to zero volts.

    Or just use an opamp with 0v capable input, driving an NPN driving a big PNP darlington. Total parts counts won't be much worse than a couple of LM317s by the time you include all the resistors and caps etc.
     
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