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100V 0.15A standard switching diode, DO-35 Switch, triple pole double throw D Switch, triple pole double throw, separate symbols K switch normally-open pushbutton push-button D Push button switch, push-to-open, generic, two pins Standard switching diode, DO-35 Quad operational amplifier, DIP-14 | | R6, R8 | 2 | 1nF | Film capacitor | | R14 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14