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Mains Hum Notch Filter PCB pattern (PDF download) [01003261] A PDF with the PCB pattern for the Notch Filter. It's a double-sided design and both layers are in a single PDF. Cat No SC3594. Price: Free Files: Notch Filter PCB (01003261).pdf (41.3KB) Related to: Project: Mains Hum Notch Filter (February 2026 [print issue] [online issue]) Other items relevant to this project: Mains Hum Notch Filter PCB [01003261] ($10.00) Mains Hum Notch Filter short-form kit ($40.00) LTspice simulation file for the Mains Hum Notch Filter (Free)