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BackCA3080 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 Envelope/Envelope.kicad_pcb | 2 Hardware/Panel/precadsr-panel/sym-lib-table | 4 .../precadsr_panel_al.kicad_pcb | 2510 .../Bigger_Push_Switch_Hole_NPTH.kicad_mod | 18 Panels/luther_triangle_vco_quentin_v3.scad | 14 pin DIP socket | | S1 | 1 | B10k | Potentiometer | | | | | Knobs | | | | | | | | | | | | | | 14 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity Micro-MaTch Vertical 1-215079-8 8-215079-18 TE-Connectivity Micro-MaTch Vertical 1-215079-6 8-215079-16 TE-Connectivity Micro-MaTch female-on-board top-entry thru-hole 8 pin DIP socket | | | | | | Tayda | A-4349 | | | R14, R15, R18 | 3 | A1M | **Potentiometer, 9 mm or 16 mm vertical board mount | | | | 4 Fireball/Fireball_panel.kicad_dru | 102 Fireball/Fireball.kicad_pro | 8 | 1N4148 | Standard switching diode, DO-35"/>