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4-stage RC network but with buffering between (some) stages. Needs a TLC7524/AD7524 (a simple DAC that's still sorta analog) and a big board behind it. Includes weird 8V linear regulator for the Adafruit Feather M0 RFM series of reflective photo interrupters/couplers, see http://www.osram-os.com/Graphics/XPic6/00200860_0.pdf reflective photo interrupter SMD PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467146/SFH%202440_EN.pdf DFN, 6 Pin (http://www.onsemi.com/pub/Collateral/NCP133-D.PDF), generated with kicad-footprint-generator XP_POWER IHxxxxD DIP DCDC-Converter XP_POWER IHxxxxS, SIP, (https://www.xppower.com/pdfs/SF_IH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-134-02-xx-DV-PE-LC, 34 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator connector JAE top entry JST EH series connector, S15B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator connector JST XH side entry connector harwin ltek M80 Harwin LTek Connector, 7 pins, pitch 3.5mm, size 32.2x7mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/2138224.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type067_RT01903HDWC pitch 10mm Varistor, diameter 15.5mm, width 11mm, pitch 7.5mm size 59x15mm^2 drill 1.2mm pad 2.4mm Terminal Block WAGO 804-112, 45Degree (cable under 45degree), 9 pins, pitch 5mm, size 37.3x14mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.mouser.com/ds/2/324/ItemDetail_1935161-922578.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block 4Ucon ItemNo. 10704 vertical pitch 3.5mm size 18.5x8.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00064 45Degree pitch 5mm size 40x7.6mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00065 45Degree pitch 5mm size 10x10mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-109, 45Degree (cable under 45degree), 12 pins, dual row male, vertical entry, strain relief clip Harwin LTek Connector, 6 pins, pitch 5mm, size 50x10mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/2138224.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 804-108, 45Degree (cable under 45degree), 1 pins, pitch 10mm, size 162x14mm^2, drill diamater 1.1mm, pad diameter 2.2mm, see http://www.mouser.com/ds/2/324/ItemDetail_1725672-916605.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00289 pitch 5.08mm.

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