where can i find op amp design problems for practice?

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Joined Jul 9, 2011
i m looking for op amp numericals of the kind such as DESING A CIRCUIT USING COMPARATOR TO DETECT POSITIVE PEAKS OF THE GIVEN SIGNAL.A i m looking for such problems involving inverting , non inverting configuration, voltage follower, log and antilog, differential, intrumentation op amps. so far i have not been able to find them anywhere on internet. can anybody refer to a website or a link?