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Cross-over point detector

Based on a Labs project | October 2011 | Find it here
Cross-over point detector
Usually, the -3 dB (and -20 dB) roll-off points on the frequency characteristic of a filter are found with the aid of an oscilloscope or a milli voltmeter. Not everyone has these instruments available, however, and it is primarily for these designers that the detector described in this article is intended . Nevertheless, even if you already have a suitable oscilloscope, you will find the detector a handy addition to your workshop instruments.
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