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BackTwo LEDs K switch normally-closed pushbutton push-button LCD D MEC 5G single pole double throw Precision Timers, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 | 4 | 1M | Resistor | | | | | S3 | 1 nF | Unpolarized capacitor | | S2 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14"/>