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Https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the number of pins: 08; pin pitch: 5.08mm; Angled; threaded flange || order number: 1843295 8A 160V Generic Phoenix Contact connector footprint for: MC_1,5/5-G-5.08; number of pins: 16; pin pitch: 3.81mm; Angled; threaded flange || order number: 1806313 12A 630V Generic Phoenix Contact connector footprint for: MC_1,5/9-G-3.5; number of pins: 07; pin pitch: 3.81mm; Angled; threaded flange || order number: 1836192 8A 320V Generic Phoenix Contact connector footprint for: GMSTBA_2,5/9-G; number of pins: 04; pin pitch: 7.50mm; Angled || order number: 1776883 12A || order number: 1847550 8A 320V Generic Phoenix Contact connector footprint for: MSTB_2,5/4-GF; number of pins: 11; pin pitch: 5.08mm; Vertical || order number: 1847495 8A 320V Generic Phoenix Contact SPT 1.5/8-H-3.5 Terminal Block, 1719406 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719406), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount Slide Switch, right-angle, https://www.ckswitches.com/media/1424/pcm.pdf 0 Littlefuse 14.73x2.54mm, 175VDC 5W, SPDT Reed Switch CT10-XXXX-G4 ALPS 5.2mm Square Low-profile Type (Surface Mount) SKQG Series, With stem, http://www.alps.com/prod/info/E/HTML/Tact/SurfaceMount/SKQG/SKQGAFE010.html ALPS 5.2mm Square Low-profile Type (Surface Mount) SKQG Series, Without stem, http://www.alps.com/prod/info/E/HTML/Tact/SurfaceMount/SKQG/SKQGAEE010.html TL3305 Series Tact Switch Low-profile SMD Tactile Switch, B3SL Middle Stroke Tactile Switch, https://www.e-switch.com/system/asset/product_line/data_sheet/165/TL3342.pdf SWITCH SMD KSA SW 4-bit rotary coded switch, gull wing, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf 4-bit rotary coded switch, through-hole, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SPST Off-On Pushbutton, 1A, 30V, CW Industries P/N GPTS203211B, http://switches-connectors-custom.cwind.com/Asset/GPTS203211BR2.pdf SPST button switch with Signal Lamp, generic K switch SPST right angle, PTS645VL58-2 LFS tactile switch https://www.ckswitches.com/media/1973/ksc7.pdf C&K Switches 1P1T SMD PTS125 Series 12mm Tact Switch Low-profile SMD Tactile Switch, B3SL Middle Stroke Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, with Boss SPST button tactile switch https://www.ckswitches.com/media/1973/ksc7.pdf C&K Switches 1P1T SMD PTS125 Series 12mm Tact Switch Low-profile SMD Tactile Switch, B3SL Middle Stroke Tactile Switch, B3SL Middle Stroke Tactile Switch, B3SL Middle Stroke Tactile Switch, B3SL Middle Stroke Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground.

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