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Sections of that diode (also U2-12) to ground to fix tuning range Add 55k-ish resistor to coarse knob (doublecheck this placement). Actual value unclear (see below).

Argument for a single 1 mm² wires, basic insulation, conductor diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/10688.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00086 pitch 10mm size 52.3x14mm^2 drill 1.15mm pad 3mm Terminal Block WAGO 236-605 45Degree pitch 7.5mm Varistor, diameter 12mm, width 4.4mm, pitch 7.5mm size 179x15mm^2 drill 1.2mm pad 3mm Terminal Block Phoenix MKDS-1,5-5-5.08, 5 pins, pitch 7.5mm, size 62.3x14mm^2, drill diamater 1.1mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00030, 9 pins, pitch 10mm, size 122x14mm^2, drill diamater 1.3mm, pad diameter 2.4mm, outer diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block 4Ucon ItemNo. 10705, vertical (cable from top), 8 pins, pitch 5mm, size 15x9mm^2, drill.

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