I dont know whether it is NJ 4556 or CD4556.

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mahesh n r

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Sir
My doubt is about an ultrasonic receiver circuit. The circiut is deccribed in the below link. **broken link removed** In the figure -13 in page 9 of this document show an IC 4556. I dont know whether it is NJ 4556 or CD4556. Please respond to me.
Thank you
Mahesh
 

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