Big 7 seg LED display

[shahidali55]

Will this work ? ? ?

[mat janssen]

Will also work on 12 volt, 15 volt.
I cannot open your schema. There is something wrong with the server I think. Because I could also not upload my diagram's like that, so I post them somewhere else, and gave a link to this forum.

[Dave]

shahidali55, Why not just use a UDN2981 for the sourcing driver as it is a direct connect to the PIC?

Dave Purola,
N8NTA

[keithdoxey]

Why not just use a UDN2981 for the sourcing driver as it is a direct connect to the PIC?

Excellent find Dave. Have downloaded the datasheet and will almost certainly be using this chip in the future.

[mat janssen]

That is indeed a nice ic, also for this solution as the CA driver. But you will lose about 2 volts over the internal output transistor.

[sayzer]

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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[shahidali55]

If the UDN2981 is available here, that'll be my first choice...
Thanks Dave for the nice chip find and Sayzer for the schematic...