analog to digital

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

  1. adamclark

    Thread Starter Member

    Oct 4, 2013
    472
    6
    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
    472
    6
    figured I would add a picture of my psu...
     
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    5,082
    1,104
    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
    13,157
    3,629
    Last edited: Nov 4, 2013
  5. adamclark

    Thread Starter Member

    Oct 4, 2013
    472
    6
    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
    13,157
    3,629
    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
    14,509
    4,278
    Digital panel meters are not cheap. Shop around.
    Or roll your own.
     
  8. MrChips

    Moderator

    Oct 2, 2009
    14,509
    4,278
  9. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    508
    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
    5,451
    1,071
    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
    472
    6
    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
    5,478
    864
    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
    472
    6
    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
    5,478
    864
    Here is the 7107 LED sample.
     
Loading...