input zener question...

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hi all!

need help on this one... bitmap uploaded... that circuit is found on the input side of my CDI.... two zeners.... i dont understand HOW it operates... lets say each zener is rated 5V each.... does it clamp the input voltage for 5V??? or 10V??




thnx in advance....
 

It will clamp at +/- 5V (or rather about 5.5 - 6V).

One zener is reverse biased ("zener mode") while the other is forward biased ("normal diode mode"), and vice versa...
 

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