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D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 KK254 Molex header Operational amplifier, DIP-8 | | C1 | 1 | 10R | Resistor | | C9 | 4 | 100 nF | Unpolarized capacitor | | R9, R11, R13 | 3 | A1M | Potentiometer .

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