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Found a simple manual EG ~$7 in parts, needing only one tl074 and support components, so tiny PCB should be possible, too * See manual step (sw13 // 1 rotary switch with ground pin http://www.ckswitches.com/media/1479/kmr2.pdf tactile push button, 6x6mm e.g. PHAP33xx series, height=9.5mm tact sw push 12mm SW PUSH SMALL Tactile C&K Generic Buzzer, D15mm height 7.5mm with RM7.6mm Generic Buzzer, D14mm height 7mm Non-Polar Electrolytic Capacitor CP, Radial_Tantal series, Radial, pin pitch=23.10mm, , diameter=24.1mm, Bourns, 2200, http://www.bourns.com/docs/Product-Datasheets/2100_series.pdf?sfvrsn=3 L_Toroid Horizontal series Radial pin pitch 15.00mm length 16.5mm width 4.9mm Capacitor C, Rect series, Radial, pin pitch=10.00mm, , length*width=11.5*2.8mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 5.00mm length 8mm width 8mm Neosid SD8 Inductor, Radial series, Radial, pin pitch=5.00mm, , diameter*width=9*5.0mm^2, Capacitor, http://www.vishay.com/docs/28535/vy2series.pdf C Disc series Radial pin pitch 15.3mm 3W length 22.2mm width 8mm L_Toroid, Vertical series, Radial, pin pitch=12.70mm, , diameter=16.8mm, Vishay, IHB-1, http://www.vishay.com/docs/34015/ihb.pdf Inductor Radial series Radial pin pitch 5.00mm length 7.2mm width 4.5mm Capacitor C, Rect series, Radial, pin pitch=8.38mm, , length*width=21.59*8.38mm^2, Pulse, G, http://datasheet.octopart.com/PE-92112KNL-Pulse-datasheet-17853305.pdf L_Toroid Vertical series Radial pin pitch 10.00mm length 11.0mm solder Pin_ with flat with hole, hole diameter 1.1mm, length 10.2mm, width 3.5mm solder Pin_ diameter 1.0mm, hole diameter 0.7mm, length 6.5mm, width 1.8mm solder Pin_ with flat with hole, hole diameter 1.2mm, length 11.3mm, width 3.0mm solder Pin_ with flat fork, hole diameter 2.0mm test point THT pad as test point, pitch 5.08mm, size 30.5x10.6mm^2, drill diamater 1.15mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00023_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-202, 45Degree (cable under 45degree), 7 pins, pitch 5.08mm, size.

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