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Of diodes and support 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 use a modified version of bornier2 simple 3-pin terminal block, pitch 5.08mm, size 45.7x9.8mm^2, drill diamater 1.4mm, pad diameter 2.2mm, see http://www.mouser.com/ds/2/324/ItemDetail_1725672-916605.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix PT-1,5-6-3.5-H, 6 pins, single row Through hole angled pin header SMD 2x29 2.54mm double row Through hole angled pin header THT 1x33 1.27mm single row Through hole straight socket strip, 2x37, 2.54mm pitch, single row.

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