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Back\*\* Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount. Only 16 mm vertical board mount 3PDT miniature toggle switch ON-ON | | | | | Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 | 4 | 100k | Resistor | | Knobs | | D6, D7 | 2 | 1N5817 | Schottky Barrier Rectifier Diode, DO-41"/>