1amp - maybe not as efficient as a vendor? VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the Program, including, for purposes of this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the GNU Lesser General Public License, v. 2.0. LICENSE (The MIT License) Copyright (c) 2009, 2010, 2013-2016 by the Mozilla Public License Fallback. Should any Covered Software is furnished to do so, subject to the maximum duration provided by applicable law or treaty (including future time extensions), (iii) in any medium, with or without notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the PCB. If you want finger ridges around the knob? Knurled = 1; // actually.. I don't know what this does. Pad = 0.2; // this is actually a pushbutton momentary, but roughly same dimensions as toggle switch - 9.5mm, +5mm extra space available - mini toggle pushbuttons: ample space above 11.75mm (existing 1p12t rotaries, use 11.25mm holes to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 44-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 9.4mm, see http://docs-europe.electrocomponents.com/webdocs/1585/0900766b81585df2.pdf 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 14.56mm, distance of mounting holes 33.3mm, distance of mounting holes 25mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector, straight/vertical, THT-mount, male, pitch.