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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.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 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 BGA-64, 10x10 raster, 10x10mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l151cc.pdf WLCSP-64, 8x8 raster, 5x5mm package, pitch 0.5mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f446ze.pdf UFBGA-169, 13x13 raster, 7x7mm package, pitch 0.4mm; see section 10.3 of https://www.parallax.com/sites/default/files/downloads/P8X32A-Propeller-Datasheet-v1.4.0_0.pdf 44-Lead Plastic Quad Flat Pack, 3x3mm Body, 0.65mm Pitch, S-PVSON-N8, http://www.ti.com/lit/ds/symlink/opa2333.pdf 3x3mm Body, 0.5mm Pitch (http://www.allegromicro.com/~/media/Files/Datasheets/ACS711-Datasheet.ashx Allegro Microsystems 12-Lead (10-Lead Populated) Quad Flat No-Lead Package, 9x9mm Body (see Microchip Packaging Specification 00000049BS.pdf TQFP, 144 Pin (https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/packaging/04r00476-02.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 42 Pin https://content.u-blox.com/sites/default/files/NINA-B1_DataSheet_UBX-15019243.pdf#page=30 NINA ublox u-blox b111 bluetooth nrf52840 module Omron Relay, DPST, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Relay, SPDT Form C, vertical mount, 6A, 5-60V, https://www.fujitsu.com/sg/imagesgig5/ftr-ly.pdf relay SPST-NO form A relay Sanyou SRD series Form C http://image.schrack.com/datenblaetter/h_rt114012--_de.pdf Relay SPST Schrack-RP3SL RM5mm 16A 250V AC Relay Finder 32.21-x000 Relay, SPDT, High Capacity, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron G5V-2 Relay DPDT Finder 40.41, Pitch 3.5mm/7.5mm, https://www.finder-relais.net/de/finder-relais-serie-40.pdf Relay DPDT Finder 40.52 Pitch 5mm IM Signal Relay SPDT Potter&Brumfield T9AP5D52 12V 30A 1xUm Connector Fast ON Only Dummy for Space NO Pads Relay RAYEX L90S SPDT relay Sanyou SRD series Form C http://image.schrack.com/datenblaetter/h_rt114012--_de.pdf Relay SPST Schrack-RP-II/1 RM5mm 8A 250V AC Relay Relay SPST Schrack-RP-II/1 RM3.5mm 8A 250V AC Form C http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FRT2_bistable%7F1116%7Fpdf%7FEnglish%7FENG_DS_RT2_bistable_1116.pdf%7F1-1415537-8 Relay DPDT Finder 40.31, Pitch 3.5mm/7.5mm, https://www.finder-relais.net/de/finder-relais-serie-40.pdf Relay DPDT Finder 40.52 Pitch 5mm relay dpdt fujitsu tht Relay DPST Schrack-RT2 RM5mm 16A 250V AC Form A http://www.alliedelec.com/m/d/543c6bed18bf23a83ae5238947033ee0.pdf Relay SPST Schrack-RP3SL RM5mm 16A 250V AC Relay Relay SPST Schrack-RP3SL RM5mm 16A 250V AC Form A Standex-Meder MS SIL-relais, Form 1A, see https://standexelectronics.com/wp-content/uploads/datasheet_reed_relay_SIL.pdf Standex-Meder SIL-relais.

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