Q. How to limit the output voltage swing only to positive direction?

A
Combination of two zener diodes
B
Combination of two rectifier diodes
C
Combination of zener and rectifier diode
D
All of the above
Solution:

To limit the output voltage swing to positive or negative direction, the basic op-amp comparator should be connected with a combination of zener and rectifier diode in the feedback path.

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