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BackAnd 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 the GitHub page (they'll have "@ something" after them) and download them as separate sheet initial kicad project .../OttosIrresistableDance.kicad_pcb | 2 | 10k | Resistor | | | | | R9, R11, R13 | 3 | A1M | Potentiometer | | Tayda | A-3588.
- = PI*KnobDiameter; Knurls = round(KnobCircumference/DistanceBetweenKnurls); Divot=CapType.
- 7C series, http://www.txccorp.com/download/products/osc/7C_o.pdf, hand-soldering, 5.0x3.2mm^2 package.
- Normal 0.0808284 0.0827209 0.993289 vertex 5.77925 -4.28385 7.9151.
- SC-74, 6 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_6_3.pdf), generated with kicad-footprint-generator.
- 4.81447 7.51797 vertex -6.51059 -0.364032 7.33259.