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Uses 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 file Images/capsocket.png b554ec2138 Add footprint items for panel holes; separate panel and Pin 1, horizontal PCB mount, color coding possible, https://www.neutrik.com/en/product/nc5fav-sw A Series, 5 pole female XLR receptacle, grounding: without ground/shell contact, lateral right PCB mount, https://www.neutrik.com/en/product/nl4md-v-r speakON Chassis Connectors, 4 pole chassis connector, nickel metal square G-size flange, self tapping screw holes (A-screw), horizontal PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc5fav-da A Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 6.25u, PCB mount, https://www.neutrik.com/en/product/nc3mbh-0 B Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, steel retention lug, vertical PCB mount, https://www.neutrik.com/en/product/ncj5fi-v-0 Combo I series, 3 pole female XLR receptacle, grounding: without ground/shell contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fahr2 A Series, 3 pole male XLR.

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