LM317 Regulator

Discussion in 'General Electronics Chat' started by justin1269, Jan 11, 2012.

  1. justin1269

    Thread Starter New Member

    Jan 11, 2012
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    Hi,

    I am using a National Semi part LM317 regulator, and I wanted to know whether someone can help me with a question.

    The Question;

    If I have a 24vdc signal coming in and I reduce it to 5vdc does it change the response time of the signal?

    Thanks
    WJ
     
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    You have to explain what you mean by "response time".
     
  3. crutschow

    Expert

    Mar 14, 2008
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    Normally a LM317 is used to regulate DC voltages which are not "signals" since they carry no dynamic information.
     
  4. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    The LM317 is quite fast and has a quick response time if you don't use any caps, or use very small caps.

    What is the fequency/periods of the incoming 24v square wave?
     
  5. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    If you try to feed high frequency AC signals into a DC regulator, you can get into all kinds of trouble by making the control loop resonate.
     
  6. crutschow

    Expert

    Mar 14, 2008
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    If you are trying to reduce a 24VDC digital signal to 5V with low power output, there are many betters ways then to use an LM317 regulator.
     
  7. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    I don't think he cares.
     
  8. Wendy

    Moderator

    Mar 24, 2008
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    The point is it is a voltage (or current) regulator for a power supply. I have seen exactly one schematic where it was used as part of an oscillator, I've never tried it for that application.

    So if you have a IC that required 5VDC, such as TTL, then this chip would be great for the application. It would convert a 12VDC power supply to a 5VDC power supply.

    One other thing, schematics are the language of electronics. When you ask a question it is pretty important to include a schematic for your application. Something like this perhaps:

    [​IMG] .. [​IMG]

    If you don't know how to attach a schematic just ask.
     
    Last edited: Jan 13, 2012
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