Absolute Value Comparator (CB21598E)

Based on common operational amplifiers, this circuit was found in Texas Instruments documentation. The power supply must be symmetrical.

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Active three-tone filter (CB20808E)
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This circuit reinforces signals in a frequency range between 1500 and 2000 Hz for use in...
Water Indicator for Filters (CB17529E)
This simple circuit indicates, through an LED, when the water level of a filter (or other kind of...