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| J8 | 1 | TL074 | Quad operational amplifier, DIP-14 | | R2, R5 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling Audio Jack, 2 Poles (Mono / TS) | | | R25 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>

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