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For schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/mic5353.pdf), generated with kicad-footprint-generator Soldered wire connection, for 6 times 0.75 mm² wires, basic insulation, conductor diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/19965.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00088, vertical (cable from top), 3 pins, diameter 5.0mm z-position of LED center 2.0mm 2 pins LED_Rectangular, Rectangular, Rectangular size 4.0x2.8mm^2 diameter 2.0mm, hole diameter 0.7mm THT pad as test point, loop diameter 1.8mm, 2 pins clear LED, Round, FlatTop, Rectangular size 5.0x2.0mm^2 z-position of LED center 1.0mm, 2 pins LED, diameter 3.0mm z-position of LED center 3.0mm, 2 pins, pitch 5.08mm, size 50.8x8.45mm^2, drill diamater 1.3mm, pad diameter 2.4mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00243, 4 pins, pitch 10mm, size 105x9mm^2, drill diamater 1.4mm, pad diameter 2.5mm, hole diameter 1.0mm THT pad as test point, pitch 3.81mm, size 15.1x7.3mm^2, drill diamater 1.3mm, pad diameter 2.4mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00018 pitch 5mm size 55x12.6mm^2 drill 1.3mm pad 2.5mm terminal block Metz Connect Type086_RT03404HBLC, 4 pins, pitch 5.08mm, size 15.2x10.6mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-13-3.5-H, 13 pins, pitch 10mm.

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