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BackBoard mount. Only 16 mm vertical board mount | | | | S2 | 1 | SW_SPDT | SPDT miniature toggle switch ON-ON | | | R16, R17, R19, R20 **Potentiometer, 9 mm vertical board mount | | R9 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | | | J7 | 1 | SW_SPDT | Switch, triple pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/>