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.
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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.
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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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"If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
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If the UDN2981 is available here, that'll be my first choice...
Thanks Dave for the nice chip find and Sayzer for the schematic...
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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 19:18.
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..........
Last edited by shahidali55; - 18th October 2006 at 19:21.
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I believe UDN2981 would be cheaper since you would have to use many transistors.
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"If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
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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...
Last edited by shahidali55; - 24th October 2006 at 18:50.
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