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Seismograph PCB pattern (PDF download) [04109051] PDF with the PCB design for the Seismograph (single-sided). This is a revised version of the original board but has since been superseded by the Mk2 version, published in the February 2013 issue. Cat No SC1658. Price: Free Files: Seismograph PCB (04109051 mk2).pdf (21.3KB) Related to: Project: Build Your Own Seismograph (September 2005 [print issue] [online issue])