Could anyone help deriving the equations used to determine the resistor values in the circuit attached please? Many Thanks!

 

Use npn instead of pnp.

 

Ok, so say they're all pnp. How do I derive the res values please?

 

But first we need to know the technical specification?

 

Here is the previous stage for which I have completed what I am required to do for this stage also. I hope this helps