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R3, R21, R27, R28 R4, R6, R7 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling Audio Jack, 2 Poles (Mono / TS) Operational amplifier, DIP-8 Standard switching diode, DO-35 | | | | R4, R6, R7, R30, R31 Switch, dual pole double throw Precision Timers, 555 compatible, PDIP-8 | | | R3, R21 | 2 | 10k | Resistor | | | | | | R17, R19 | 2 | 1N5817 | Schottky.

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