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Button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | R15, R20, R22 | 2 | 1N5817 | Schottky diode | | | | | | | Tayda | A-2939 | | R3, R21 | 2 | 10R | Resistor | | | | | Tayda | A-559 | | | | Tayda | A-3186 | | | Q1, Q2, Q3 | 3 | 2_pin_Molex_header | KK254 Molex header 2.54 mm spacing | | | | R25 | 1 | B10k | Potentiometer | | R8, R10, R12 | 3 | A1M | Potentiometer | | Tayda | A-3588 | | | | | | | | | U3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | J12 | 1 | 3_pin_Molex_connector | 3 | A1M .

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