[SOLVED] why these diodes are connected in rev bias?

[amit bonage]

hi,
Can anybody answer why these diodes are connected in rev bias? here is the link to my question.
(those are to regulate the voltage but how come a simple diode works in reverse bias?)

https://electronics.stackexchange.c...gn-a-protection-clipper-circuit-for-adc-input

 

[yadavvlsi]

Reverse biased zener diode acts as voltage regulator.

http://amrita.vlab.co.in/?sub=1&brch=282&sim=1207&cnt=1

 

[johnjoe]

Maybe you mean the second picture: Just simulate in your brain what happens if the input signal becomes larger as VCC or smaller as GND ;-).

 

[dick_freebird]

They are reverse biased because you don't want anything
from them under normal operation. They are there so you
survive abnormal overvoltage.