need help - zero crossing detector

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manjul

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I am facing problem in my zero crossing detector circuit.

I have used non -inverting OPAMP fort he zero crossing detector.

I have given 5V AC at non inverting input thr. resistor. Inverting terminal ground. VCC +15 & -VCC -15V.

I am getting square wave output but spike imposed in square o/p of negative cycle.

Can anybody help?
 

find attached waveform
 

The error is apparenly caused by the input voltage exceeding OP common mode range. You can use e. g. two antiparallel 1N4148 or similar at the OP input to limit the input voltage.
 

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