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Input. Portamento (aka slew rate controller aka glide). - Knob version fairly simple. CV version maybe possible, but a bitmap generator is available for arbitrary text (using size = 200) at: https://www.myfonts.com/collections/quentin-font-urw?tab=individualStyles font_for_label = "Futura XBlk BT:style=Extra Black"; // waves out wall(h=4, w=width_mm-hole_dist_top-4); // one more to mount a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer 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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92 leads in-line, wide, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot361-1_po.pdf TSSOP, 28 Pin (http://www.onsemi.com/pub/Collateral/601AE.PDF), generated with kicad-footprint-generator Soldered wire connection, for 4 times 0.25 mm² wires, reinforced insulation, conductor diameter 0.5mm, outer diameter 1mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Tantalum Capacitor SMD 1210 (3225 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: http://datasheets.avx.com/AVX-HV_MLCC.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 22-27-2141, 14 Pins per row (http://www.molex.com/pdm_docs/sd/1053131208_sd.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-8S-0.5SH, 8 Pins (http://www.molex.com/pdm_docs/sd/559350530_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py LQFP, 176 Pin (https://www.onsemi.com/pub/Collateral/566DB.PDF), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 42819-32XX, With thermal vias in pads, 6 Pins per row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator Harting har-flexicon series connector, S14B-XASK-1N-BN (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, old mpn/engineering number: 1-770870-x, 3 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 Connector Phoenix Contact, SPT 2.5/3-H-5.0 Terminal Block, 1751066 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1751066), generated with kicad-footprint-generator JST XA series connector, B09B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-1230, 12 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator connector wire 2.5sqmm strain-relief Soldered wire connection with double feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator JST PH series.

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