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(nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version 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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-dfn/(DCB6)%20DFN%2005-08-1715%20Rev%20A.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py HVQFN, 24 Pin (https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/44000000MDkO/lWPNMeJClEs8Zvyu7AlDlKSyZqhYdVpQzFLVfUp.EXs), generated with kicad-footprint-generator Inductor SMD 1806 (4516 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py MultiPowerSO-30 3EP 16.0x17.2mm Pitch 1mm (http://www.st.com/resource/en/datasheet/vnh2sp30-e.pdf MultiPowerSO-30 3EP 16.0x17.2mm Pitch 1mm (http://www.st.com/resource/en/datasheet/vnh2sp30-e.pdf MultiPowerSO-30 3EP 16.0x17.2mm Pitch 1mm (http://www.st.com/resource/en/datasheet/vnh2sp30-e.pdf MultiPowerSO-30 3EP 16.0x17.2mm Pitch 1mm ST PowerSSO-24 1EP 7.5x10.3mm Pitch 0.8mm [JEDEC MO-271] (http://www.st.com/resource/en/datasheet/tda7492p.pdf, http://freedatasheets.com/downloads/Technical%20Note%20Powersso24%20TN0054.pdf ST PowerSSO-24 1EP 7.5x10.3mm Pitch 0.8mm 8-Lead Plastic Dual Flat, No Lead Package (MD) - 4x4x0.9 mm Body [LFCSP]; (see https://www.intersil.com/content/dam/Intersil/documents/l72_/l72.10x10c.pdf LFCSP VQ, 48 pin, exposed pad: 4.5x8.1mm, with thermal vias; see figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf TDFN, 6 Pin (http://www.ti.com/lit/ds/symlink/tps61040.pdf#page=35), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-102-02-xxx-DV-LC, 2 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 Samtec HLE.

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