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BackBoard mount OR: **Potentiometer, 16 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | 8 | 1N4148 | Standard switching diode, DO-35 2x5 pin shrouded header 2.54 mm spacing | | Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7, R30, R31 Switch, dual pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | 1 | SW_3PDT_x3 | Switch, triple pole double throw K switch spdt single-pole double-throw spdt ON-ON D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8"/>