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BackMK'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 wrong side of that diode (also U2-12) to ground to fix this and turn it into a solid square wave. Easiest bodge on the front panel and Pin 1, horizontal PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.75u PCB Cherry MX keyswitch, 2.00u, http://matias.ca/switches/ Matias ALPS keyswitch 2.25u PCB Cherry MX keyswitch, 2.00u, vertical, PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3faah1-da AA Series, 3 pole female XLR receptacle, grounding: separate ground contact connected to trigger, gate jack is normalized\nto +12 V, 10 mA -12 V ## Photos [to be added] ## Documentation: * [Schematic](Docs/precadsr.pdf) * PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) * [BOM](Docs/precadsr_bom.md) * [Build notes](Docs/build.md ## GitHub repository ## Git repository * [https://github.com/holmesrichards/precadsr](https://github.com/holmesrichards/precadsr) * [https://gitlab.com/rsholmes/precadsr](https://gitlab.com/rsholmes/precadsr This repo uses submodules aoKicad and Kosmo\_panel. To clone: Repo uses submodules.
- 10x7.6mm^2, drill diamater 1.15mm, pad.
- B14B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with.