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help in this Circuit conn

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brian25

brian25

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hi sir/ma'am what's the function of the pins in this relay and where application they can usually use? tnx


PC817-500x500_zpsc54a2727.jpg
 
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It's a photocoupler, the data-sheet is:

**broken link removed**

It is used to transfer signal with galvanic isolation. As an example can be used in DC/DC converter fedback path as you can see in (page 6):

**broken link removed**
 

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