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Schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules main 5a4e89eea6 Add position for resistor between coarse and +12V, value unknown .. Fireball VCO saw wave core.circuitjs.txt 90 lines main MK_VCO/Schematics/MK_VCO_RADIO_SHAEK_try2_ground_rail.diy 8102 lines E-Switch sub miniature slide switch, JS series, DPDT, right angle, PTS645VL31-2 LFS tactile switch Light Touch Switch, https://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE28.pdf 0 Light Touch Switch, https://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE28.pdf 0 4 2 Button_Switch_SMD SW_SPST_EVQPE1 Light Touch Switch, http://industrial.panasonic.com/cdbs/www-data/pdf/ATK0000/ATK0000CE3.pdf SMD SMT ceramic resonator filter DSS6 SMD Resomator/Filter Murata DSN6, http://cdn-reichelt.de/documents/datenblatt/B400/DSN6NC51H.pdf, length*width=7.0x2.5mm^2 package, package length=6.0mm, package width=3.0mm, 2 pins LED diameter 5.0mm z-position of LED center 1.0mm, 2 pins, diameter 5.0mm z-position of LED center 9.0mm 2 pins LED diameter 8.0mm 2 pins LED, diameter 8.0mm, 2 pins, diameter 5.0mm z-position of LED center 2.0mm 2 pins diameter 3.0mm Plated Hole as test point, loop diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00276_DB_EN.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00003, 4 pins, pitch 3.5mm, size source Multi-Contact FLEXI-E 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 5, Wuerth electronics 9774025243 (https://katalog.we-online.de/em/datasheet/9774025243.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.7mm, height 6, Wuerth electronics 9774060360 (https://katalog.we-online.de/em/datasheet/9774060360.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-125-02-xx-DV-PE-LC, 25 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Inductor SMD 2512 (6332 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: https://www.vishay.com/docs/40182/tmch.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 46007-1106, With thermal vias in pads, 2 Pins per row (http://suddendocs.samtec.com/prints/lshm-1xx-xx.x-x-dv-a-x-x-tr-footprint.pdf), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 43045-2400 (alternative finishes: 43045-122x), 6 Pins per row, Mounting: PCB Mounting Flange (http://www.molex.com/pdm_docs/sd/039291047_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, LY20-14P-DLT1, 7 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, DF3EA-09P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing&lang=en&documentid=0001163317), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 28 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/8008S.pdf#page=16), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 1, Wuerth electronics 9774010943 (https://katalog.we-online.de/em/datasheet/9774010943.pdf), generated with kicad-footprint-generator connector Hirose DF13 through hole, DF11-26DP-2DSA, 13 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000992393), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin.