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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 Latest commits for file Schematics/bad_trace_v1.jpeg add pic Schematics/bad_trace_v1.jpeg | Bin 70804 -> 71304 bytes viewBox="0 0 8.5 11" d="m 2.1692854,6.5787405 h 0.622047 v 0.6220475 h -0.456693 -0.165354,-0.1574803 z" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.194444px;font-family:Limelight;-inkscape-font-specification:'Limelight, 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;fill:#000000;stroke-width:0.0104167">KASSU / AO 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;display:inline;opacity:1;vector-effect:none;fill:#ffffff;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: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;fill:#ffffff;stroke-width:0.0104167" 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">ON d="M 3.2823957,9.1601362 H 3.5674658" d="m 3.4251969,3.0511802 v 0.196852" d="m 3.5236175,7.2834656 h -0.19685" d="m 3.4251919,5.8070862 v 0.196852" d="m -3.4448861,11.41733 h -0.19685" d="m -3.5433111,11.318904 v 0.196852" d="m -6.7913424,11.41733 h -0.19685" d="M -3.5433071,7.381896 V 7.5787465" d="m -6.7913384,7.4803212 h -0.19685" d="M -3.5433109,9.54725 V 9.744101" d="m -3.4448859,9.645676 h -0.19685" d="m -6.8897674,12.893708 v 0.19685" d="m -6.7913424,12.992133 h -0.19685" d="m 3.4251927,4.4291344 v 0.196852" d="m -6.7913424,11.41733 h -0.19685" d="m -2.5590543,2.521019 v 0.07874" d="M 2.992121,8.8569411 H.

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