how zener functions in the circuit?

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zippora

Joined Aug 27, 2016
10
Please find attached the file. Here Zener ZD1 is 10V zener. What can be the purpose of introducing zener there?


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New Doc 12_zippora.gif
 

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AlbertHall

Joined Jun 4, 2014
12,345
The ZD1/Q1 operates the relay when the supply voltage is high enough, in this case around 12V.
When the voltage is lower the zener doesn't conduct, Q1 and the relay are off.
 
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