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R3, R21, R27, R28 R4, R6, R7 | 3 | 10uF | Polarized capacitor | | | | | | | | | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | U3 | 1 | SW_Push | Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | C1 | 1 | 1uF.

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