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Got 60Hz or 50Hz interference? — Parallax Forums
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50 Hz twin T passive notch filter circuit. | Download Scientific Diagram
Op Amp Notch Filter: Active Filter Circuit » Electronics Notes
Active Notch Filter Simulation - Electrical Engineering Stack Exchange
50 Hz Notch Filter Used to Eliminate Power Line Frequencies in the System | Download Scientific Diagram
Figure 1 from A 50 Hz SC notch filter for IoT applications | Semantic Scholar
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Notch Filter Circuits with Design Details - Homemade Circuit Projects
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Anti-hum filter circuit for 50 Hz
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