you have inverted Q4 and is not correctly connected, the emitter should be connected to the power supply
0v at the base of Q7 turn it off so there is no current through R15 which means no voltage drop so the base of Q4 gets 12v and turns off
The usual way is to drive the seven segment in parallel and control through the common anode or common cathode pin which display to turn on.
Not quite accurate 1 transistor for each 7 seg and one transitor for each segment but all same segments joined together no transistor for themYes, one transistor to each segment to be able to turn it on/off independently
Alex
Not quite accurate 1 transistor for each 7 seg and one transitor for each segment but all same segments joined together no transistor for them
**broken link removed**
The usual way is to drive the seven segment in parallel and control through the common anode or common cathode pin which display to turn on.
I know we drive the 7 segment in parallel.
You can use a high side switch array like UDN2982
But they are using TPIC6C595 alone to drive without using any transistor.
You can use common anode displaySER0 -> to IC of next digit
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