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Calliope (Hummingbird Mk2) PCB pattern (PDF download) [01111212] A PDF with the PCB pattern for the Calliope amplifier module. It's a double-sided design and both layers are in a single PDF. Cat No SC3600. Price: Free Files: Calliope PCB (01111212).pdf (43.0KB) Related to: Project: Calliope Amplifier (April 2026 [print issue] [online issue]) Other item relevant to this project: Calliope (Hummingbird Mk2) PCB [01111212] ($5.00)