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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 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot266-1_po.pdf SSOP, 20 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0140.PDF (T1655-4)), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MC_1,5/15-GF-3.5; number of pins: 02; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1843648 8A 160V Generic Phoenix Contact connector footprint for: MC_1,5/11-G-3.81; number of pins: 13; pin pitch: 3.81mm; Vertical || order number: 1923982 16A (HC Generic Phoenix Contact SPT 5/11-H-7.5-ZB 1719286 Connector Phoenix Contact, SPT 2.5/3-V-5.0-EX Terminal Block, 1719273 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719273), generated with kicad-footprint-generator Molex Pico-Clasp series connector, DF52-3S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator Molex Picoflex Ribbon-Cable Connectors, 90325-0012, 12 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator connector Molex Micro-Fit_3.0 horizontal connector Molex Mini-Fit_Sr side entry JST SHL series connector, 501331-0907 (http://www.molex.com/pdm_docs/sd/5013310207_sd.pdf), generated with kicad-footprint-generator JST J2100 series connector, SM03B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-0810, with PCB locator, 9 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 9, Wuerth electronics 9774140960 (https://katalog.we-online.de/em/datasheet/9774140960.pdf,), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-1410, with PCB locator, 13 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV-A, 8 Pins (http://www.molex.com/pdm_docs/sd/908140004_sd.pdf), generated with kicad-footprint-generator JST SH series connector, B26B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 55560-0501, 50 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 Mounting Hardware, inside through hole 3.3mm, height 12, Wuerth electronics 9774020482 (https://katalog.we-online.de/em/datasheet/9774020482.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 105309-xx07, 7 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing⟨=en&documentid=0000994748), generated with kicad-footprint-generator JST PHD series connector, 502585-0870 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, S08B-XASK-1N-BN (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 6-Lead Plastic DFN (3mm x 2mm) (see Linear Technology 05081955_0_DHC18.pdf DHD Package; 16-Lead Plastic Small Outline Package (MS) [MSOP], variant of 10-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), Socket, LongPads 14-lead though-hole mounted DIP package, row spacing 10.16 mm (400 mils), LongPads 6-lead though-hole mounted DIP package, row spacing 9.53 mm (375 mils 14-lead surface-mounted (SMD) DIP package, row spacing 11.48 mm (451 mils 8-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 6-lead though-hole mounted DIP package, row spacing.

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