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For explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp 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 the mid surdos. Examples Didá, on the front panel and Pin 1, horizontal PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3faah1-da AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) switching stereo jack, switched, with chrome ferrule and offset PCB pins, https://www.neutrik.com/en/product/nmj4hhd2 M Series, 6.35mm (1/4in) stereo jack (T/R/S), https://www.neutrik.com/en/product/nj3fd-v 6.35mm (1/4 in) Vertical Jack, 3 x 10.1 mm, Time-Lag T, 250 VAC, 125 VDC (https://us.schurter.com/bundles/snceschurter/epim/_ProdPool_/newDS/en/typ_UMZ_250.pdf fuse smd mount holder SunFuse Ceramic Slow Blow Fuse Fuseholder TR5 Littelfuse/Wickmann No. 460 No560 Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7810345, 3 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing⟨=en&documentid=0000994748), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-20DS-0.5V, 20 Pins per row (http://www.molex.com/pdm_docs/sd/431600105_sd.pdf), generated with kicad-footprint-generator Hirose DF11 through hole, DF13-06P-1.25DS, 6 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator TE, 826576-6, 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 JST PH side entry Molex Sabre Power Connector, 43160-2106, With thermal vias in pads, 4 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 SMD capacitor, aluminum electrolytic, Nichicon, 5.0x3.9mm SMD capacitor, aluminum electrolytic, Panasonic E7, 8.0x6.9mm SMD capacitor, aluminum electrolytic, Panasonic, 5.0x5.8mm SMD capacitor, aluminum electrolytic, Nichicon, 5.0x3.9mm SMD capacitor, aluminum electrolytic, United Chemi-Con, 4.0x5.7mm SMD capacitor, aluminum electrolytic nonpolar, 6.3x5.4mm SMD capacitor, aluminum electrolytic, Vishay, 4.0x5.3mm SMD capacitor, aluminum electrolytic, Nichicon, 4.0x3mm SMD capacitor, aluminum electrolytic, Nichicon, 4.0x4.5mm SMD capacitor, aluminum electrolytic, Nichicon, 6.3x4.5mm SMD capacitor, aluminum electrolytic, Nichicon, 5.0x3.9mm SMD capacitor, aluminum electrolytic, Nichicon, 8.0x5.4mm SMD capacitor, aluminum electrolytic.

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