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BackCircle translate? Not sure. Circle_radius = knob_radius_top; // just match the top surface of the board, cross at 90° to minimize capacitance between traces - .3mm for non-power lines, .6mm if carrying power MK 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 schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 Fireball/Fireball.kicad_pro | 93 Fireball/Fireball.kicad_sch | 48 dd8c61c34f A couple more minor clearance tweaks couple more GND-stitch vias Undo converting GND to GND_JMP and fix everything that broke created pull request 'Finish schematic, add PDF' (#2) from schematic by Eeschema 5.1.10-88a1d61d58~90~ubuntu20.04.1 **Component Count:** 76 | Refs | Qty | Component | Description | Vendor | SKU | | | | | R25 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x7 | | | Tayda | A-804 | | U1 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x4 | | | | J7 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>