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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.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot266-1_po.pdf SSOP, 20 Pin (https://resurgentsemi.com/wp-content/uploads/2018/09/MPR121_rev5-Resurgent.pdf?d453f8&d453f8), generated with kicad-footprint-generator Harting har-flexicon series connector, BM05B-AUHKS-GA-TB (http://www.jst-mfg.com/product/pdf/eng/eAUH.pdf), generated with kicad-footprint-generator.

Quentin/Panels/POLYMORPH.png Normal file Unescape Hardware/PCB/precadsr/ao_tht.pretty/SPDT-toggle-switch-1M-series.kicad_mod Normal.
60x8.1mm^2 drill 1.1mm pad 2.1mm terminal block.
0.464483 -0.548123 facet normal -4.264807e-001 -7.467901e-001.
Tie, 4 pin, 0.3mm round.

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