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Build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp https://www.youtube.com/watch?v=pQKN30Mzi2g - maybe not as efficient as a full threaded nose, https://www.neutrik.com/en/product/nsj12hf-1 Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj8hc Stacking Jacks, Stereo dual jack, quick fix nose, https://www.neutrik.com/en/product/nsj12hl Combo I series, 3 pole XLR female receptacle with 6.35mm (1/4in) switching stereo jack, metal nose with efficient chassis ground connection, T+R+S normalling contact, https://www.neutrik.com/en/product/nrj6hm-1-au Slim Jacks, 6.35mm (1/4in) stereo jack, horizontal PCB mount, https://www.neutrik.com/en/product/ncj10fi-h-0 Combo I series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nl4md-h speakON Chassis Connectors, 4 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3mav B Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fav2-da A Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel. Possibly do as an edge cut? Corrected in Rev 2.0 alpha 1: Properly assign potentiometer pads and thermal vias; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l151cc.pdf WLCSP-64, 8x8 raster, 3.347x3.585mm package, pitch 0.4mm; http://ww1.microchip.com/downloads/en/devicedoc/atmel-8235-8-bit-avr-microcontroller-attiny20_datasheet.pdf#page=208 WLCSP-16, 1.409x1.409mm, 16 Ball, 4x4 Layout, 0.35mm Pitch, http://www.latticesemi.com/view_document?document_id=213 Analog Devices (http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5542.pdf LFCSP 8pin 2x2mm Pitch 0.5mm https://www.nxp.com/docs/en/application-note/AN10343.pdff Fairchild-specific MicroPak-6 1.0x1.45mm Pitch 0.5mm LFCSP, 16 Pin (http://www.ti.com/lit/ds/symlink/ina3221.pdf#page=44), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 11.6, Wuerth electronics 9775116360 (https://katalog.we-online.com/em/datasheet/9775116360.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py 100-Lead Plastic Thin Quad Flatpack (PT) - 7x7x1.0 mm Body, 2.00 mm Footprint [TQFP] thermal pad (http://www.analog.com/media/en/technical-documentation/data-sheets/AD9852.pdf 80-Lead Plastic Thin Quad Flatpack (PT) - 10x10x1 mm Body, 2.00 mm Footprint [HTQFP] thermal pad with vias HTSSOP, 20 Pin (JEDEC MO-153 Var GB https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 1.5/10-H-3.5 1990818 Connector Phoenix Contact, SPT 2.5/12-H-5.0-EX 1732483 Connector Phoenix.

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