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Yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (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 https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm Highspeed card edge connector for PCB's with 20 contacts (polarized Highspeed card edge connector for 2.4mm PCB's with 30 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 40 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 08 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 40 contacts (not polarized Connector PCBEdge molex EDGELOCK Generic Phoenix Contact connector footprint for: GMSTBVA_2,5/5-G-7,62; number of pins: 11; pin pitch: 5.08mm; Angled; threaded flange || order number: 1923982 16A (HC Generic Phoenix Contact SPT 5/6-H-7.5-ZB 1719231 Connector Phoenix Contact, SPT 5/5-H-7.5-ZB Terminal Block, 1732386 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732386), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 43045-0800 (alternative finishes: 43045-082x), 4 Pins (http://www.molex.com/pdm_docs/sd/559320530_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-107-02-xxx-DV-BE-A, 7 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 .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-143-02-xx-DV-TE, 43 Pins per row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-2610, 26 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 40 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation AC), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times 0.75 mm² wires, reinforced insulation, conductor diameter 1.25mm, outer diameter 3.6mm, 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 JST XA series connector, BM07B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 48 Pin.

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