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An op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 .../Unseen Servant/Unseen Servant.kicad_pro | 40 .../Unseen Servant/Unseen Servant.kicad_sch Normal file Unescape Hardware/PCB/precadsr/ao_tht.pretty/Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHoles_centered.kicad_mod Normal file Unescape Hardware/Panel/precadsr-panel/precadsr-panel.pretty/precadsr-panel-art.kicad_mod Normal file View File Schematics/Unseen Servant/Unseen Servant Front Panel v2.kicad_pcb Normal file View File 3D Printing/Cases/Eurorack 2-Row/d6aac07ae9184a927e3520e79cd5c366_preview_featured.jpg Executable file View File Images/precadsr-panel-holes.png Normal file Unescape Hardware/Panel/precadsr-panel/precadsr-panel.sch Normal file Unescape Schematics/SynthMages.pretty/PinSocket_1x03_P2.54mm_Vertical.kicad_mod Normal file View File Latest commits for file Fireball/Fireball.kicad_pro Latest commits for file Schematics/MK_VCO_RADIO_SHAEK_try1.diy Binary files /dev/null and b/3D Printing/AD&D 1e spell names in Filmoscope Quentin/POLYMORPH.png differ Binary files /dev/null and b/Hardware/Panel/precadsr_panel.png differ Cell (black box KASSU / AO Grid is metric (mm), left edge centeris at (50,150). Notey increases upward here but downward in KiCad. Pot (9 / 16 mm)2 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00452398">2 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00740353">12 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00740353">3 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00452398">6 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00452398">8 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00452398">6 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00740353">8 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00740353">10 style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:center;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:middle;white-space:normal;shape-padding:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0104167;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.008648;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.0104167">10 style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.0104167" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.0104167" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0104167;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" d="M 1.8897638,8.0472441 H 1.2204724" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.138889px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0104167;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" d="M 1.8897638,8.0472441 H 1.2204724" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.138889px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;display:inline;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0104167;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" d="M 3.8976378,8.4645669 V 9.4094488 H 2.007874 V 8.4645669 h 0.9448819 c 0,0 -0.050754,0 0.9448819,0 z" style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.194444px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00740353">6 style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.00740353">10 style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.0104167" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.008648;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:0.138889px;font-family:'Copasetic NF';-inkscape-font-specification:'Copasetic NF, 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style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" 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