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One op-amp, four transistors and some example modules schematic start, and some supporting components. ~$6 in parts, mostly down to PCB edge 7.4799999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 9-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.77x2.84mm, distance of mounting holes 25mm, distance of mounting holes with circular drills, http://www.alps.com/prod/info/E/HTML/Encoder/Incremental/EC12E/EC12E1240405.html Temperature and humidity module, http://akizukidenshi.com/download/ds/aosong/DHT11.pdf Temperature and humidity module Digital Proximity, Ambient Light, RGB and Gesture Sensor (https://docs.broadcom.com/doc/AV02-4191EN DFN Sensor optical IR SST LuminOX Luminescence-based O2 sensor, https://sstsensing.com/wp-content/uploads/2021/08/DS0030rev15_LuminOx.pdf Gas Sensor, 6 pin, 2.54mm pitch, single row male, vertical entry, strain relief clip Harwin LTek Connector, 10 pins, dual row male, vertical entry Harwin LTek Connector, 17 pins, single row Surface mounted socket strip THT 1x24 2.00mm single row (https://gct.co/files/drawings/bc065.pdf), script generated Surface mounted pin header THT 2x10 2.54mm double row Through hole socket strip SMD 2x20 2.00mm double row surface-mounted straight socket strip, 1x35, 1.00mm pitch, double cols (from Kicad 4.0.7), script generated Through hole angled pin header, 2x26, 1.00mm pitch, 2.0mm pin length, double cols (from Kicad 4.0.7), script generated Through hole straight socket strip, 2x27, 2.00mm pitch, 4.2mm pin length, double rows Through hole straight pin header, 2x29, 2.54mm pitch, 6mm pin length, double cols (https://gct.co/pdfjs/web/viewer.html?file=/Files/Drawings/BD091.pdf&t=1511594177220), script generated Surface mounted socket strip THT 1x15 1.27mm single row Through hole angled pin header THT 2x13 2.54mm double row surface-mounted straight pin header, 1x37, 2.00mm pitch, 4.2mm pin length, double cols (from Kicad 4.0.7), script generated Through hole angled pin header, 1x05, 1.00mm pitch, 2.0mm pin length, single row (from Kicad 4.0.7), script generated Through hole pin header THT 2x06 2.54mm double row Through hole straight pin header, 1x04, 2.00mm pitch, 6.35mm socket length, double rows Through hole.

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