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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 (or derived from) the Work and publicly distribute the Program is Distributed as Source Code, in accordance with section 3.2, and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice and this permission notice appear in all copies or substantial portions of the use and distribution as defined by Sections 1 and 2 connected via insulated copper area below body, vias included (case drawing: https://ww2.minicircuits.com/case_style/CD542.pdf, land pattern PL-079, including GND vias (https://ww2.minicircuits.com/pcb/98-pl230.pdf Footprint for Mini-Circuits case HF1139 (https://ww2.minicircuits.com/case_style/HF1139.pdf Footprint for Mini-Circuits case HZ1198 (https://ww2.minicircuits.com/case_style/HZ1198.pdf Footprint for Mini-Circuits case GP731 (https://ww2.minicircuits.com/case_style/GP731.pdf Footprint for Mini-Circuits case HZ1198 (https://ww2.minicircuits.com/case_style/HZ1198.pdf Footprint for the Adafruit Feather WICED Wifi board, https://learn.adafruit.com/introducing-the-adafruit-wiced-feather-wifi Adafruit Feather 32u4 FONA board, https://learn.adafruit.com/adafruit-feather-32u4-fona Adafruit Feather M0 RFM series of reflective photo interrupter SMD PhotoDiode, plastic SMD SmatDIL PhotoDiode plastic SMD SmatDIL PhotoDiode plastic SMD DIL PhotoDiode, plastic SMD DIL PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467144/SFH%202430_EN.pdf PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467144/SFH%202430_EN.pdf PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467144/SFH%202430_EN.pdf PhotoDiode, plastic DIL, 4.3x4.65mm², RM5.08 PhotoDiode plastic SMD DIL, 4.5x4mm² PhotoDiode plastic DIL RM5.08 PhotoTransistor, sidelooker package, RM2.54 PhotoTransistor sidelooker package RM2.54 package for Kodenshi SG-105 with PCB locator, 5 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator ipc_gullwing_generator.py SOP, 8 Pin (https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-a/mt25q_qljs_u_256_aba_0.pdf#page=22), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 4 times 1 mm² wire, basic insulation, conductor diameter 0.5mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py FE Package; 16-Lead Plastic DFN (3mm x 3mm) (see Linear Technology 05081955_0_DHC18.pdf.

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