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Variable Power Supply, Project

Discussion in 'Power Electronics' started by trickster771, Jan 10, 2012.

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  1. trickster771


    Jan 9, 2012

    Hi all,

    With reference to the above image link of a variable power supply could anybody help me with regards to the best way of putting an LCD display to show the output voltage selected when using the potentiometer?

    If possible could it be highlighted where exactly to put it and what type of LCD display. I was looking to purchase one out of the RS catalog, but there are so many.

    It is a 1.2-30v 1.5A variable regulated power supply.

    Thankyou for your time. :)
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    An LCD alone won't do.
    You need a simple voltage measurement module like for example here: Meters.htm

    You place the measurement inputs of the module right across the output connections of the power supply (thats where the voltmeter is shon in the figure you've linked). You will need to supply the module independently from the regulated output with a stable supply voltage. For that you could tap the rectified voltage of the supply (Pin 2 of the LMxxx) and add an auxiliary voltage regulator (e.g. LM7805 or whatever the module requires). If you're lucky, the module comes with its own voltage regulator.

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