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Tl074 and 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 (or derived from) the Work or (ii) the combination of speakON socket and 6.35mm (1/4in) switching stereo jack, unswitched, fully threaded nose, https://www.neutrik.com/en/product/nsj12hf-1 Stacking Jacks, Mono dual jack, half threaded nose, https://www.neutrik.com/en/product/nrj6hh-au Slim Jacks, 6.35mm (1/4in) stereo jack, metal nose with efficient chassis ground connection, T+R+S normalling contact, https://www.neutrik.com/en/product/nrj6hm-1 Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj8hc Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj8hc Stacking Jacks, Stereo dual jack, half threaded nose, https://www.neutrik.com/en/product/nrj6hf Slim Jacks, 6.35mm (1/4in) mono jack, switched, with full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj6hcd3 M Series, 6.35mm (1/4in) mono jack without switching contact, horizontal PCB mount, replaces NL8MD-V, https://www.neutrik.com/en/product/nl8mdxx-v 4 contacts, 3.5mm audio plug, https://www.cuidevices.com/product/resource/pdf/sp-3541.pdf DC Barrel Jack, https://cdn-shop.adafruit.com/datasheets/21mmdcjackDatasheet.pdf Barrel jack connector 6P6C Shielded RJ45 ethernet magnetic transformer connector horizontal angled 90deg THT male pitch 2.77x2.54mm pin-PCB-offset 9.4mm 9-pin D-Sub connector, straight/vertical, THT-mount, male, pitch 2.41x2.54mm, pin-PCB-offset 9.4mm, see http://docs-europe.electrocomponents.com/webdocs/1585/0900766b81585df2.pdf 15-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm pin-PCB-offset 4.9399999999999995mm mounting-holes-distance 47.1mm mounting-hole-offset 47.1mm 44-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.77x2.84mm, pin-PCB-offset 14.56mm, distance of mounting holes to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 4.9399999999999995mm, distance of mounting holes to PCB edge 10.889999999999999mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.41x1.98mm, pin-PCB-offset 9.4mm, see http://docs-europe.electrocomponents.com/webdocs/1585/0900766b81585df2.pdf 62-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.77x2.84mm, pin-PCB-offset 14.56mm, distance of mounting holes to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 9-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.29x1.98mm, pin-PCB-offset 9.4mm, see http://docs-europe.electrocomponents.com/webdocs/1585/0900766b81585df2.pdf 9-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm mounting holes distance 63.5mm 37-pin D-Sub connector horizontal angled 90deg THT female pitch 2.29x1.98mm pin-PCB-offset 9.4mm 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.29x1.98mm, distance of.

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