Big 7 seg LED display

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  1. - 18th October 2006, 14:14 #1
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    Hi Dave,

    Thanks for the info.

    If the circuit below is a correct operation, then this chip is indeed nice.

    Is it correct?



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    <img src="http://img8.picsplace.to/img8/22/UDN.GIF" alt="Image Hosting by PicsPlace.to" >

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  2. - 18th October 2006, 18:03 #2
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    Smile

    If the UDN2981 is available here, that'll be my first choice...
    Thanks Dave for the nice chip find and Sayzer for the schematic...
  3. - 18th October 2006, 18:09 #3
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    I found another cheap alternative...
    <img src="http://www.winpicprog.co.uk/graphics/lamp_source2.gif" border="0" alt="" /></div>
    Last edited by shahidali55; - 18th October 2006 at 18:18.
  4. - 18th October 2006, 18:19 #4
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    ..........
    Last edited by shahidali55; - 18th October 2006 at 18:21.
  5. - 18th October 2006, 18:38 #5
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    I believe UDN2981 would be cheaper since you would have to use many transistors.


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  6. - 24th October 2006, 17:43 #6
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    Hi everyone, thanks for all your help.
    I made my LED clock using transistors cause i couldn't get the UDN2981.
    It works great. I added an hourly animation and a battery battery backup also ( i cant belive i'm getting more than 20 hours out of a 60mAh rechargeble battery {with display off}).
    I've attached a picture of it...
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    Last edited by shahidali55; - 24th October 2006 at 17:50.
  7. - 24th October 2006, 18:26 #7
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    Good to see something is working!

    FYI: Upon the chip info above, I checked the prices.
    The price of UDN2981 is around US$1.60-1.70 (for 1000s lots), which is a lot more expensive then traditional ULN2003 types.


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  8. - 28th May 2007, 18:35 #8
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    Quote Originally Posted by shahidali55 View Post
    Hi everyone, thanks for all your help.
    I made my LED clock using transistors cause i couldn't get the UDN2981.
    It works great. I added an hourly animation and a battery battery backup also ( i cant belive i'm getting more than 20 hours out of a 60mAh rechargeble battery {with display off}).
    I've attached a picture of it...
    shahidali55,
    May I get your schem about the final Common Anoda display 7 segment (12 V) to me, couse i've same problem with you before.
    thanks for helping ...

    [email protected]
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