seven segment dispaly with decoder

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afouladi86

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sevensegment dispaly

hi to all
why we use transistor in ( Binary to 7-segment with Decoder)i need a circuit schematics that show this application of transistor,also seven segment is common chatode.
thanks
 

binary to seven segment decoder

If you want to use multiple segments with only one decoder you need to creates a multiplexed display, so here we need transistors driving the cathode signals and corresponding anode patterns of each digit in a repeating, continuous succession.

theory:
**broken link removed**
 

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