Building a "valley detector"

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does know op-amp implementation of "valley detector", assume 1 calls opposite of peak detector? need find baseline of signal can reject it. want op-amp circuit instead of daq can in real time.

i'm dealing dc signals, if makes difference. "valley" positive nonzero voltage.

probably, it's same peak detector, negative peaks instead of positive. schem shown here, need reverse diodes make register negative peaks.
http://en.wikipedia.org/wiki/peak_detector#peak_detector


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