You want to design short circuit protection for an OCL (output capacitor-less) amplifier ?
Here is an example which uses some fuses: 正在载入中,请稍等
But, I guess you'd be better off with here: https://electronics.stackexchange.com/ unless this problem has also some relevance to Arduino.
Edit:
For an “OCL type” amplifier, I’ve just noticed that the example quoted above has a remarkably large output capacitor! It does have some fuses though.