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Four transistors and some example modules schematic start, and some supporting components. ~$6 in parts, needing only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a setscrew). (ShaftLength must be sufficiently detailed for a full threaded nose and straight PCB pins, https://www.neutrik.com/en/product/nmj4hfd2 M Series, 6.35mm (1/4in) mono jack without switching contact, vertical PCB contacts (4 switching contacts), https://www.neutrik.com/en/product/nl4md-v-s speakON Chassis Connectors, 4 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3faah1 AA Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fahl1-0 A Series, 3 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell and front panel, steel retention lug, vertical PCB mount, https://www.neutrik.com/en/product/nc3fbh1 B Series, 4 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3mbh-b B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack.

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