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1x4 | | | Screws and spacers (see build notes Change C13 to 10 nF | Unpolarized capacitor | | | | | | | | | | | | | 1 | TL071 | Operational amplifier, DIP-8 | | C3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14

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