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An LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a work based on https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm BGA-64, 10x10 raster, 4.775x5.041mm package, pitch 0.4mm; see section 6.1 of http://www.st.com/resource/en/datasheet/stm32f405og.pdf WLCSP-100, 10x10 raster, 4.618x4.142mm package, pitch 0.8mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f301r8.pdf WLCSP-49, 7x7 raster, 3.417x3.151mm package, pitch 0.8mm Altera BGA-68 M68 MBGA Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/DM00366448.pdf WLCSP-168, 12x14 raster, 4.891x5.692mm package, pitch 0.8mm; see section 10.3 of https://www.parallax.com/sites/default/files/downloads/P8X32A-Propeller-Datasheet-v1.4.0_0.pdf 44-Lead Plastic Thin Shrink Small Outline Narrow Body Body [QSOP] (see Microchip Packaging Specification 00000049BS.pdf DFN, 6 Pin (https://toshiba.semicon-storage.com/info/docget.jsp?did=11791&prodName=TLP185), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-135-02-xxx-DV-BE-A, 35 Pins per row (http://www.molex.com/pdm_docs/sd/431600105_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin (JEDEC MO-153 Var EA https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for a drone / manual version, https://kassu2000.blogspot.com/2018/07/avalance-vco.html for a single 2.5 mm² wire, reinforced insulation, conductor diameter 1.7mm, outer diameter 2.1mm, size source Multi-Contact FLEXI-xV 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for a single 2 mm² wire, basic insulation, conductor diameter 1.25mm, outer diameter 1.7mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E_0.25 (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 Sabre Power Connector, 43160-2103, 3 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator JST XA series connector, B04P-NV (http://www.jst-mfg.com/product/pdf/eng/eNV.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, B04P-NV (http://www.jst-mfg.com/product/pdf/eng/eNV.pdf), generated.

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