Simple 7 Segment Display Circuit

[HacknMod]

Is there any reason why the circuit below wouldn't work?

 

[heathyoung]

Because there is something missing in the microcontroller code? (You have programmed the micro correctly?)

 

[bigmoose]

Looks like you are feeding your topside PNPs with 9 volts. With the micro output ports at 5v you will be pulling the base down to ~5v so they will all be partially on. If you float the micro's outputs, they will trickle through the micro's ESD diodes to the +rail through the micro.

Also to lower your battery current, you should be able to raise R13's to 10K and R14's to 100K and still have it work with a decent beta NPN.

 

[heathyoung]

Ah yes I missed that!