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BackRadio, RF, Module, http://www.hoperf.com/upload/rf/RFM69HW-V1.3.pdf 8 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see [build notes](build.md)) | | Knobs | | | | Tayda | A-804 | | R24, R26, R28 | 3 pin Molex header 2.54 mm spacing D Switch, three position, dual pole double throw, separate symbols | | | | | J2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>