In my class, we are to design a current amplifier with short circuit protection.
In our design, we utilized 2 emitter follower amplifiers (Q3, and Q1). We then added Q4 and Q7 to lighten the current load on Q6 when the output RL is shorted. This worked fine so that none of the output transistors (Q4,Q7, and Q6) were over the maximum power dissipation.
Here is the problem... When the output is shorted, the collectors of Q3 and Q1 have about 500mA going through them. This is clearly too high. If we add resistors, it adds noise to our output. What can we do to fix our amplifier? Do you know of an easier short circuit protection or how to fix ours?