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Amazon.com: Ebtech Hum X AC Plug Ground Line Voltage Filter Hum Eliminator + Microfober Cloth (Rebranded to Morley) : Musical Instruments
Notch Filter Design: A Narrow Band Filter for Specific Noise Attenuation
Handy dandy little circuit #9
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Adaptive 60 Hz Noise Cancellation
Adaptive 60 Hz Noise Cancellation
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Anti-hum filter circuit for 60 Hz
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Two Op-Amps 60 Hz Notch Filter – Simple Circuit Diagram
