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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 http://www.latticesemi.com/view_document?document_id=213 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera BGA-153 M153 MBGA Altera VBGA V81 BGA-81 Altera BGA-100 M100 MBGA 121-ball, 0.8mm BGA (based on standard DIP-4), row spacing 7.62 mm (300 mils), SMDSocket, LongPads 12-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size (see http://www.kingtek.net.cn/pic/201601201417455112.pdf SMD 5x-dip-switch SPST KingTek_DSHP05TJ, Slide, row spacing 7.62 mm (300 mils), LongPads 12-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), LongPads THT DIP DIL PDIP 2.54mm 7.62mm 300mil Three phase, Bridge, Rectifier, https://www.comchiptech.com/admin/files/product/SC35VB80S-G%20Thru506369.%20SC35VB160S-G%20RevB.pdf 4-lead dip package for Kodenshi SG-105 with PCB locator, 7 Pins (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=826576&DocType=Customer+Drawing&DocLang=English), generated with kicad-footprint-generator Mounting Hardware, external M3, height 12, Wuerth electronics 97730606332 (https://katalog.we-online.com/em/datasheet/97730606332.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 12 Pin (https://www.renesas.com/us/en/document/psc/package-drawing-tdfn-12pin-l123x3c), generated with kicad-footprint-generator connector wire 0.75sqmm double-strain-relief Soldered wire connection with double feed through strain relief, for 4 times 0.75 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 2.7mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_312051_RT045xxUBLC_OFF-022759T.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type011_RT05502HBWC, 2 pins, diameter 5.0mm Tantal Electrolytic Capacitor CP, Axial series, Axial, Horizontal, pin pitch=7.62mm, , length*diameter=14.5*5.8mm^2, Fastron, HBCC, http://www.fastrongroup.com/image-show/18/HBCC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Horizontal pin pitch 7.50mm length 10mm width 3.0mm Capacitor C, Rect series, Radial, pin pitch=2.50mm, , diameter=6.3mm, Electrolytic Capacitor CP, Axial series, Axial, Horizontal, pin pitch=28.5mm, , length*diameter=20.32*12.07mm^2, Vishay, IHA-101, http://www.vishay.com/docs/34014/iha.pdf Inductor Axial series Axial Horizontal pin pitch 10.00mm length 11.0mm width 6.4mm height 6.4mm Resistor, Axial_Power series, Box, pin pitch=25.4mm, 2W, length*diameter=11.9*4.5mm^2, http://www.vishay.com/docs/20128/wkxwrx.pdf Resistor Axial_DIN0414 series Axial Horizontal pin pitch 5.08mm, size 61x10.6mm^2, drill diamater 1.1mm, pad diameter 2.1mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Mounting Hardware, external M3, height 12, Wuerth electronics 9771130360 (https://katalog.we-online.com/em/datasheet/9771130360.pdf), generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Angled solder pin 1 x 1 mm, 734-142 , 12 Pins (http://www.molex.com/pdm_docs/sd/908140004_sd.pdf), generated with kicad-footprint-generator Molex SPOX side entry JST VH series connector, B10B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSOP, 8 Pin (http://www.ti.com/lit/ds/symlink/lm5017.pdf#page=31), generated with kicad-footprint-generator LED 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.

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