Hello,

I am trying to run a large 7 segment display.

My setup is currently a SN74HC595N connected to BC327 transistors. And should supply 8V to the individual segments. I have a display with a common cathode.

Somehow I have planned something wrong and don't understand what my problem is. Below is my diagram, to keep it simple I have only drawn one LED.

Thanks for your help in advance

 

If you are using a PNP common emitter driver, then the emitter must be common to the rest of the positive supply.
It is much more usual to use an NPN transistor so then all the emitters are at 0V.
You have no current limiting resistor for the LED.

 

I don't understand what your problem is either as you never said what you expected and what
actually happened.