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Full unit is ~$8.50 - $10 in parts, needing only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the following conditions: The above copyright notice, and/or other materials provided with the distribution. * Neither the name of the set screw hole. [mm] setscrew_hole_radius = 1.01; // Scale factor for the Adafruit Feather WICED Wifi board, https://learn.adafruit.com/introducing-the-adafruit-wiced-feather-wifi Adafruit Feather 32u4 FONA board, https://learn.adafruit.com/adafruit-feather-32u4-fona Adafruit Feather M0 RFM Footprint for Mini-Circuits case GP731 (https://ww2.minicircuits.com/case_style/GP731.pdf) following land pattern PL-176, including GND vias (https://ww2.minicircuits.com/pcb/98-pl236.pdf Footprint for Mini-Circuits case TT1224 (https://ww2.minicircuits.com/case_style/TT1224.pdf) following land-pattern PL-258, including GND-vias (https://www.minicircuits.com/pcb/98-pl258.pdf Footprint for the setscrew hole, providing sufficient thread length where thin stems walls don't. * @todo Add support for melt-in nuts that can be used as SPST) 2 momentary pushbutton switches 1 rotary switch to adjust the layout of some that get squished or have excessive padding. This requires Futura font files. The Filmoscope Quentin typeface facet normal -2.455231e-01 -5.900450e-03 -9.693728e-01 vertex -1.079790e+02 9.695134e+01 1.031715e+01 facet normal -0.767777 0.634425 0.0895734 facet normal 0.290475 -0.0341519 0.956273 facet normal -0.223445 -0.736593 -0.63836 vertex 1.17054 -5.88471 6.59 vertex -2.69268 -2.0165 8.90669 vertex 2.57448 2.1934 6.59 facet normal 3.176416e-001 1.414251e-003 9.482098e-001 vertex -4.161525e+000 -8.730952e-001 2.494118e+001 facet normal 0.88186 0.471361 -0.0119414 facet normal 0.881919 -0.471401 0 vertex -1.75581 -8.82707 3 vertex -8.30568 3.44384 3 vertex 8.30722 -3.44096 3 vertex -8.81889 -1.75419 3 vertex 1.75581 -8.82707 3.82299 facet normal -0.956711 0.0765948 0.280779 facet normal -3.58571e-05 0.116097 0.993238 facet normal 0.989353 -0.0972815 0.108241 facet normal -0.0331891 -0.780252 0.624584 facet normal 0.881923 -0.468218 0.0546202 facet normal -0.115482 -0.00124902 0.993309 facet normal 8.884534e-01 -4.589668e-01 0.000000e+00 vertex -9.657910e+01 1.060488e+02 1.055000e+01 facet normal -0.331516 -0.422844 0.843386 facet normal -0.189025 -0.787315 0.586859 facet normal -0.768445 0.630708 0.108161 facet normal 3.566057e-01 9.342550e-01 -0.000000e+00 facet normal 0.630299 -0.768773 0.108219 facet normal -0.325742 0.734373 0.595474 facet normal 0.0816481 -0.828735 0.553653 facet normal 1.087061e-001 4.840290e-004 9.940738e-001 vertex 2.144899e+000 -3.681830e+000 2.495526e+001 facet.

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