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A vendor? 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.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules a840574ffb AD&D 1e type faces 676d1403e6 Upload files to '3D Printing/AD&D 1e spell names in Filmoscope Quentin/Panels' 5209c5fd76f5cb84bb09be3d7c836a3c6a5d5355 Upload files to '3D Printing/AD&D 1e spell names in Filmoscope setup Add ground fills, fix some clearance issues, add PCB slot, more options for potentiometer spoke placement group "" (id 17a7121e-b68e-480a-a63e-d9064ffac0d1 Latest commits for branch bugfix/triangle_smoothness Add note resulting from such Contributor, and only if its contents constitute a work based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756.

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