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Digital realm, or perhaps an external CV-to-pulse-rate module? Is this even useful? Seven-segment display. Can be done, but requires a trigger-sized pulse on input. Portamento (aka slew rate controller aka glide). Knob version fairly simple. - CV out - could be done with a 7-segment display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler IR Receiver Vishay TSOP-xxxx, CAST package, see https://www.vishay.com/docs/82493/tsop311.pdf package for Everlight ITR8307/F43, see https://everlighteurope.com/index.php?controller=attachment&id_attachment=5385 package for Everlight ITR8307/F43, see https://everlighteurope.com/index.php?controller=attachment&id_attachment=5385 package for Vishay CNY70 refective photo coupler/interrupter Vishay CNY70 refective photo coupler/interrupter Vishay CNY70 refective photo coupler/interrupter Vishay CNY70 refective photo coupler package for Siemens SFH900 reflex photo interrupter SMD PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467144/SFH%202430_EN.pdf PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467144/SFH%202430_EN.pdf PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467146/SFH%202440_EN.pdf DFN, 6 Pin (https://docs.broadcom.com/docs/AV02-4755EN), generated with kicad-footprint-generator JST PH series connector, S15B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Diode SMD 2010 (5025 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: IPC-SM-782 page 80, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-119-02-xxx-DV-BE-LC, 19 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 20 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/doc2535.pdf#page=164), generated with kicad-footprint-generator Molex CLIK-Mate series connector, B15B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, B2PS-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: A-41792-0007 example for new part number: 26-60-4080, 8 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator Connector Phoenix Contact SPT 5/4-H-7.5-ZB Terminal Block, 1719192 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719192), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 8, Wuerth electronics 9774060243 (https://katalog.we-online.de/em/datasheet/9774060243.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 0.15 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 1mm, size source Multi-Contact FLEXI-E 0.15 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 2 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E 0.15 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer.

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