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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 Envelope/Envelope.kicad_pcb | 2 | 10R | Resistor | | | | R30 | 1 | 3_pin_Molex_header | 3 | 22k | Resistor | | Screws and spacers (see [build notes](build.md | | | | | | | | | | Tayda | A-1605 | | | | | | U3 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | R21, R22, R23 | 3 | 10uF | Electrolytic capacitor | | | R16, R18, R26 | 3 | 100R | Resistor | | R15, R20, R22 | 2 create mode 100644 Hardware/PCB/precadsr/ao_symbols.dcm create mode 100644 Panels/luther_triangle_vco_quentin_v3_only_art.stl create mode 100644 3D Printing/Rails/36hp_outie.stl | Bin 0 -> 33312 bytes Panels/FireballSpellVertSmaller.png | Bin 0 -> 510084 bytes // Width of module (HP) width = 17; // [1:1:84] /* [Holes] */ hole_dist_top = 2.5; // margins from edges h_margin = hole_dist_side*4; v_margin = hole_dist_top*2 + thickness; right_rib_x = width_mm - h_margin; cv_in = [h_margin, row_1, 0]; fm_in = [h_margin+working_width/8, row_2, 0]; fm_lvl = [second_col, second_row, 0]; //Third row interface placement triangle_out = [output_column, row_2, 0]; triangle_out = [width_mm-h_margin-working_width/4, row_1, 0]; audio_out_2 = [right_col, row_7, 0]; manual_1 = [left_col, row_7, 0]; audio_out_1 = [right_col, row_1, 0]; fm_in = [input_column - h_margin/2, row_1, 0]; audio_out_2 = [right_col, row_6, 0]; cv_1b_atten = [right_col, row_7, 0]; audio_out_1 = [right_col, row_2, 0]; fm_lvl = [second_col, third_row, 0]; fm_lvl = [h_margin+working_width/8, row_3, 0]; manual_2 = [left_col, row_5, 0]; cv_in_2a = [left_col, row_6, 0]; cv_1b_atten = [right_col, row_5, 0]; cv_in_2a = [left_col, row_5, 0]; cv_in_2a = [left_col, row_6, 0]; audio_in_1 = [left_col.

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