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Schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the Gate In jack and switching ground contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc5fbh B Series, 5 pole female XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fahl-0 A Series, 5 pole female XLR receptacle, grounding: separate ground contact connected to EP (http://www.aosmd.com/res/packaging_information/DFN5x6_8L_EP1_P.pdf 56-Lead Plastic Quad Flat, No Lead Package - 3x3 mm Body [DFN] (see Microchip Packaging Specification 00000049BS.pdf 20-Lead Plastic Quad Flat, No Lead Package (MD) - 4x4x0.9 mm Body [QFN]; (see Microchip Packaging Specification 00000049BS.pdf UQFN, 20 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_20_05-08-1711.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 48 Pin (http://www.st.com/resource/en/datasheet/stm32f042k6.pdf#page=94), generated with kicad-footprint-generator Molex LY 20 series connector, SM10B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 6 times 0.75 mm² wires, basic insulation, conductor diameter 0.5mm, outer diameter 3.6mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Angled solder pin 1 x 1 mm, 734-133 , 3 pins, pitch 5mm, size 30x9mm^2, drill diamater 1.3mm, pad diameter 2.1mm, size source Multi-Contact FLEXI-E/HK 0.127 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-147-02-xxx-DV-LC, 47 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-0910, with PCB locator, 5 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039300020_sd.pdf), generated with kicad-footprint-generator connector Molex MicroClasp Wire-to-Board System, 55935-1310, with PCB cutout, light-direction upwards, see http://www.everlight.com/file/ProductFile/ITR8307.pdf Relay SPST, http://www3.panasonic.biz/ac/e_download/control/relay/power/catalog/mech_eng_jw.pdf?via=ok Relay SPST Schrack-RP3SL RM5mm 16A 250V AC Relay Relay SPST Schrack-RT1 RM5mm 16A 250V AC Relay Relay SPST Schrack-RT2 RM5mm 16A 250V AC Form A (NO), SPST http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FPCH_series_relay_data_sheet_E%7F1215%7Fpdf%7FEnglish%7FENG_DS_PCH_series_relay_data_sheet_E_1215.pdf Relay socket DPDT Finder 40.31 Pitch 3.5mm Relay DPDT Omron relay G6H-2, see http://cdn-reichelt.de/documents/datenblatt/C300/G6H%23OMR.pdf Omron G6K-2F relay package http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf Omron G6K-2P-Y relay package http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf Omron G6K-2P-Y relay package http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf Omron G6K-2P-Y relay package http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf Omron G6K-2P-Y relay package http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf Omron G6K-2P-Y relay package http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf Omron G6K-2F-Y relay package http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf Relay Omron G6S-2G, see http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6s.pdf Relay Omron G6SK-2G, see http://omronfs.omron.com/en_US/ecb/products/pdf/en-g6s.pdf Fujitsh FTR B3S B3SA Relay J JLeg AXICOM HF3-Series Relay Pitch 1.27mm HSOP 11.0x15.9mm Pitch 0.65mm Slug Down Thermal Vias (PowerSO-20) [JEDEC MO-166] (http://www.st.com/resource/en/datasheet/vn808cm-32-e.pdf, http://www.st.com/resource/en/application_note/cd00003801.pdf HSOP, 54 Pin (https://www.nxp.com/docs/en/package-information/98ASA10506D.pdf), generated with StandardBox.py.

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