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Back| 4.7 uF | Polarized capacitor | | S3 | 1 | B10k | Potentiometer | | | | | Tayda | A-157 | | R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7, R30, R31 Switch, dual pole double throw, separate symbols K switch SPST angled PTS645VL31-2 LFS tactile switch SPST LED OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D Push button switch, generic, two pins Switch, single pole normally-open illuminated tactile switch SPST angled PTS645VL39-2 LFS tactile switch D Switch, single pole double throw K switch normally-open pushbutton push-button 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