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tester for RS422 help needed

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lucbra

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hello,

I'm trying to build a RS422 voltage level tester.
The spec dictates a level above 2V and below -2V as a minimum.

I tried allready a comparator design but this doesn't seem to function (see attached). The opamp gets really hot.

Could anybody assist?

comparator.png
 

The two outputs are shorted, you required to add two diodes between outputs.

Regards
P.Ashok Kumar
 
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