seven segment dispaly with decoder

[afouladi86]

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

 

[mister_rf]

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**