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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 the footprint. Some options: Bourns PTL series, such as: Update README.md 83b013c3637bfb179ad62b90a6c8b2f5fb547c8c Update README.md * [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 ## GitHub repository https://github.com/holmesrichards/precadsr Submodules git clone git@github.com:holmesrichards/precadsr.git git clone --recurse-submodules git@github.com:holmesrichards/precadsr.git ``` Schematics/Enlarge/Enlarge.kicad_pcb Normal file View File Panels/title_test_36.stl Normal file View File 3D Printing/Pot_Knobs/pot_knob_two_parts_base.stl create mode 100644 Images/PXL_20210831_002553634.jpg Latest commits for file Images/PXL_20210831_004139245.jpg 054c37512a Delete '3D Printing/AD&D 1e spell names in Filmoscope Quentin/Panels/COLOR SPRAY.png' Delete '3D Printing/AD&D 1e spell names in Filmoscope Quentin/Panels/BLADE BARRIER.png and /dev/null differ Latest commits for file Schematics/SynthMages.pretty/IDC-Header_2x05_P2.54mm_Vertical_Fixed_Ground_Fill.kicad_mod Fix annoyance of 2x05 IDC header THT 2x30 2.54mm double row Through hole angled pin header, 2x39, 2.54mm pitch, double cols (from Kicad 4.0.7), script generated Through hole socket strip THT 2x24 2.54mm double row Through hole straight socket strip, 1x18, 1.27mm pitch, 4.0mm pin length, double rows Through hole straight socket strip, 1x06, 2.00mm pitch, double cols (from Kicad 4.0.7), script generated Through hole socket strip SMD 1x25 2.00mm single row Through hole angled socket strip, 2x29, 1.27mm pitch, double rows Through hole straight pin header, 2x01, 2.54mm pitch, double rows Surface mounted socket strip THT 2x15 2.00mm double row Through hole angled socket strip THT 2x07 2.54mm double row surface-mounted straight pin header, 1x23, 1.00mm pitch, single row style1 pin1 left Surface mounted pin header SMD 1x03 2.54mm single row Through hole socket strip THT 2x09 1.00mm double row Through hole angled pin header THT 1x32 2.00mm single row style2 pin1 right Through hole straight socket strip, 2x11, 1.27mm pitch, double cols (from Kicad 4.0.7), script generated Surface mounted socket strip SMD 1x38 2.54mm single row Through hole pin header THT 1x22 2.00mm single row Through hole angled socket strip, 2x17, 2.54mm pitch.

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