How does the speedup capacitor affect the collector voltage in a circuit?

[peripatein]

Homework Statement

I'm asked to qualitatively draw two curves, one on top of the other: the resulting signal in Q4’s collector with and without the effect of the speedup capacitor (see attachment).

Homework Equations

The Attempt at a Solution

I used the net to find the graphs in attachment 2. Do the curves in this attachment indeed demonstrate the effect of the speedup capacitor as requested in the question? I'm not sure.

 

[Hesch]

Homework Statement

I'm asked to qualitatively draw two curves, one on top of the other: the resulting signal in Q4’s collector with and without the effect of the speedup capacitor (see attachment).

Homework Equations

The Attempt at a Solution

I used the net to find the graphs in attachment 2. Do the curves in this attachment indeed demonstrate the effect of the speedup capacitor as requested in the question? I'm not sure.

No, you are asked to draw two curves for the collector voltage, V_c. You have drawn the curves for the basis voltage, V_b.

 

[peripatein]

You are right. How may I then draw the curves for the collector voltage?