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An LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ 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 use a raspberry pi zero through hole 3.3mm, height 2, Wuerth electronics 97730406334 (https://katalog.we-online.com/em/datasheet/97730406334.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 32 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation DA), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 16 Pin (https://www.stcmicro.com/datasheet/STC15F2K60S2-en.pdf#page=156), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 54722-0604, 60 Pins (http://www.molex.com/pdm_docs/sd/555600207_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 48 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2358-16.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LGA, 14 Pin (https://www.ti.com/lit/ml/msop002a/msop002a.pdf), generated with kicad-footprint-generator Hirose DF11 through hole, DF11-8DP-2DSA, 4 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator Harting har-flexicon series connector, B13B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-133-02-xxx-DV-LC, 33 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039300020_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-115-02-xxx-DV-BE-A, 15 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 ipc_gullwing_generator.py DSO DSO-8 SOIC SOIC-8 Infineon PG-DSO 12 pin, exposed pad, DDA0008J (http://www.ti.com/lit/ds/symlink/tps5430.pdf Texas Instruments (http://www.ti.com/lit/ds/symlink/tps22993.pdf QFN, 24 Pin (https://www.st.com/resource/en/datasheet/stp16cp05.pdf#page=25), generated with kicad-footprint-generator Inductor SMD Wuerth WE-DD TypL TypXL TypXXL Shielded Coupled Inductor, Wuerth Elektronik, Wuerth_MAPI-2510, 2.5mmx2.0mm Inductor, Wuerth Elektronik, Wuerth_MAPI-3012, 3.0mmx3.0mm Inductor, Wuerth Elektronik, Wuerth_HCI-1350, 12.8mmx12.8mm Inductor, Wuerth Elektronik, Wuerth_HCI-1050, 10.2mmx10.2mm Inductor, Wuerth Elektronik, WE-PD, SMD, Typ MS, https://katalog.we-online.com/pbs/datasheet/744774022.pdf Choke Power Inductor WE-PD2 TypMS Wuerth Power Inductor, Ms50, SMD, Fixed inductor, SMD, magnetically shielded, https://neosid.de/import-data/product-pdf/neoFestind_SMSME3010.pdf Neosid Inductor SMs50 Fixed inductor SMD magneticaly shielded Neosid, Inductor, SM-PIC1004H, Fixed inductor, SMD, magneticaly shielded, https://neosid.de/import-data/product-pdf/neoFestind_ma_SMs42.pdf Neosid, Inductor, SMS-ME3010, Fixed inductor, SMD, magneticaly shielded, https://neosid.de/import-data/product-pdf/neoFestind_Ms42.pdf Neosid Inductor SM-NE95H Fixed inductor SMD Neosid, Power Inductor, Wuerth Elektronik, Wuerth_HCI-7030, 6.9mmx6.9mm Inductor, Wuerth Elektronik, Wuerth_MAPI-4020, 4.0mmx4.0mm Inductor, Wuerth Elektronik, Wuerth_HCM-1240, 10.0mmx11.8mm Inductor, Wuerth Elektronik, Wuerth_HCI-7040, 6.9mmx6.9mm Inductor, Wuerth Elektronik, Wuerth_HCI-7050, 6.9mmx6.9mm Inductor, Wuerth Elektronik, Wuerth_MAPI-2512, 2.5mmx2.0mm Inductor, Wuerth Elektronik, WE-PD2, SMD, Typ L, , https://katalog.we-online.com/pbs/datasheet/74477510.pdf Choke Power Inductor Ms50 SMD Fixed inductor high temperature Neosid, Ms85, Ms85T, SMD Inductor, Fixed inductor, SMD, https://neosid.de/import-data/product-pdf/neoFestind_SMPIC0512H.pdf Neosid Inductor SMs50 Fixed inductor Neosid, Power Inductor, Ms50.

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