analog to digital

Discussion in 'General Electronics Chat' started by adamclark, Nov 4, 2013.

  1. adamclark

    Thread Starter Member

    Oct 4, 2013
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    hello again,, how hard would it be to make the volt/amp guage of my psu a digital display in stead of analog? its a variable supply with a pot. knob not a switch so when rolling up the voltage the display would have to roll with it?
     
  2. adamclark

    Thread Starter Member

    Oct 4, 2013
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    figured I would add a picture of my psu...
     
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    probably simple..
    If the analog meter is full scale (so if Vin to meter = Vout) then just buy a digital meter and hook it up to it.... Note you will need a constant voltage for the power supply of the digital meter too..
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Last edited: Nov 4, 2013
  5. adamclark

    Thread Starter Member

    Oct 4, 2013
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    so that's it? the digital meter hooks right up to the same wires that the analog one uses? I just figured there would be something tricky about it..
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    We can make it tricky if you prefer. ;)

    The Red Lion PDF give you an idea what is needed, there are various models with varying complexity.
    Max.
     
  7. MrChips

    Moderator

    Oct 2, 2009
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    Digital panel meters are not cheap. Shop around.
    Or roll your own.
     
  8. MrChips

    Moderator

    Oct 2, 2009
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  9. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    Easy. We used to get self contained dig displays where the full scale was selectable as either 200 mV or 2V.
     
  10. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Be careful... A lot of the inexpensive DPMs cannot share a common connection between their own power pins and the negative of the voltage they are measuring... The more expensive ones usually can...
     
  11. adamclark

    Thread Starter Member

    Oct 4, 2013
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    I think I would like to build my own using 7 segment led displays.. I feel I could a lot from a project like that.. so where do I start?
     
  12. ScottWang

    Moderator

    Aug 23, 2012
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    You can using ICL7107 for LED, and it's easy to change when the LED was damaged.
     
  13. adamclark

    Thread Starter Member

    Oct 4, 2013
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    I was just reading on that ic... it seems amazing that it does everything that's needed and then some.. I wonder if its available at the local esco?
     
  14. ScottWang

    Moderator

    Aug 23, 2012
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    Here is the 7107 LED sample.
     
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