Download AN-20 An Applications Guide for Op Amps (pdf) from National

The original of this Application Note is from 1969, and it was re-released by National in 2009 because most of its content is still very relevant today. It contains 26 Op Amp circuits and each of them is described in detail, ranging in complexity from the simple inverting amplifier to a full wave rectifier and averaging filter circuit, an analog mulitplier and a sine wave oscillator. You should be able to benefit from most of the descriptions if you have a basic understanding of Op Amps and electronics.

You should also take a look at some recommendations for other Op Amp Applications.

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