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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 Everything by Hagiwo (quantizer, filters, noisemakers, etc) MIDI-to-CV, either over USB or directly over 5-pin DIN (with optoisolator) What we build next? Pretty confident we do know we need a noise and envelope generator synth module. Layout and panel are Kosmo format. * [Schematic](Docs/precadsr.pdf) * PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) * [BOM](Docs/precadsr_bom.md) * [Build notes](Docs/build.md ``` git clone git@github.com:holmesrichards/precadsr.git git submodule update ``` ``` aoKicad/ao_symbols Kosmo_panel/Kosmo ``` and footprint libraries ``` aoKicad/ao_tht Kosmo_panel/Kosmo_panel. ``` From 5cacbfea2e523d618ea3bcbc0bca9c37eb36f10d Mon Sep 17 00:00:00 2001 Subject: [PATCH] More traces and vias, and net links Schematics/Unseen Servant/fp-info-cache | 85626 main synth_tools/Schematics/SynthMages.pretty/Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHoles_Shaft_Centered.kicad_mod 48 lines Assembly Notes: More notes C10, C14 too small for film; is film needed? From cb59d1e9c06865f5bebe8c7ee0afa4859e0766b2 Mon Sep 17 00:00:00.

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