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BackMount | | Tayda | A-1531 or A-557 | | Tayda | A-2939 | | | | | Tayda | A-1624 or A-2969 | | | J3, J4, J5 | 3 | 1k | Resistor | | | 14 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see [build notes](build.md | | J1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14