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** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot556-1_po.pdf 24-Lead Plastic Shrink Small Outline (SN) - Narrow, 3.90 mm Body [DFN] (see Microchip Packaging Specification 00000049BS.pdf DFN, 6 Pin (https://www.nxp.com/docs/en/package-information/SOT457.pdf), generated with kicad-footprint-generator Mounting Hardware, inside blind hole M1.6, height 2.5, Wuerth electronics 9775106960 (https://katalog.we-online.com/em/datasheet/9775106960.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, 42820-62XX, 6 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 5569-24A2, example for new mpn: 39-28-904x, 2 Pins per row, Mounting: PCB Mounting Flange (http://www.molex.com/pdm_docs/sd/039291047_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-A, 41 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 2.5/10-H-5.0 1991053 Connector Phoenix Contact connector footprint for: MSTBV_2,5/7-GF; number of pins: 10; pin pitch: 7.62mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1766246 12A 630V Generic Phoenix Contact connector footprint for: GMSTBA_2,5/2-G-7,62; number of pins: 05; pin pitch: 3.50mm; Vertical || order number: 1843910 8A 160V Generic.

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