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A CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Latest commits for branch pcb_finalization re-re-remove the mysterious extra trace 5040873587dbb57684343269abab88d35cf7124b Update Schematics/schematic_bugs_v1.md b2f0340111348a8deafde0ffe244939fe4eeb6b7 add pic 0252301f35 Go to file f63cfba954 Embiggen traces, add teardrops updated C5 footprint & tracing; schematic annotation update with full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj6hcd3 M Series, 6.35mm (1/4in) mono jack, switched, fully threaded nose, https://www.neutrik.com/en/product/nsj12hf-1 Stacking Jacks, Mono dual jack, half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj3hf-1 Slim Jacks, 6.35mm (1/4in) stereo jack, unswitched, fully threaded nose, https://www.neutrik.com/en/product/nsj12hh-1 Stacking Jacks, Stereo dual jack, full nose, https://www.neutrik.com/en/product/nsj12hc Stacking Jacks, Stereo dual jack, half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj6hf-1-au Slim Jacks, 6.35mm (1/4in) stereo jack, switched, with chrome ferrule and straight PCB pins, https://www.neutrik.com/en/product/nmj6hcd3 M Series, 6.35mm (1/4in) mono jack, switched, with full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj6hfd4 M Series, 6.35mm (1/4in) stereo jack, switched, half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj6hh-1 Slim Jacks, 6.35mm (1/4in) mono jack without switching contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc5fav B Series, 5 pole female XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3fbv1 B Series, 4 pole male XLR receptacle, grounding: mating connector shell and front panel, steel retention lug, horizontal PCB mount, replaces NL4MD-V-1, https://www.neutrik.com/en/product/nl4mdxx-v-3 speakON Chassis Connectors, 8 pole chassis connector, grey D-size flange, self tapping screw holes (A-screw), vertical PCB mount, replaces NL4MD-V-1, https://www.neutrik.com/en/product/nl4mdxx-v-3 speakON Chassis Connectors, 4 pole chassis connector, gray D-size flange, countersunk thru holes, vertical PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3fbv2-b B Series, 3 pole female XLR receptacle, grounding: without ground/shell contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mah A Series, 3 pole male XLR receptacle, grounding: mating connector shell and front.

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