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BackSupport 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 https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm Highspeed card edge connector for 1.6mm PCB's with 05 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 20 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 30 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 60 contacts (polarized Highspeed card edge connector for PCB's with 70 contacts (polarized Highspeed card edge connector for 2.4mm PCB's with 20 contacts (polarized Highspeed card edge connector for 2.4mm PCB's with 05 contacts (polarized Highspeed card edge connector for PCB's with 20 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 30 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 05 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 30 contacts (not polarized Highspeed card edge card connector socket for 2.36mm PCBs, vertical, alignment pins, weld tabs, board locks (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf 0.8 mm Highspeed card edge connector for PCB's with 05 contacts (polarized Highspeed card edge connector for IQRF TR-x2DA(T) modules, http://iqrf.org/weben/downloads.php?id=104 Bluetooth v4.2 + NFC module Modtronix Wireless SX1276 LoRa Module (http://modtronix.com/img/prod/imod/inair9/inair_dimensions.gif Modtronix LoRa inAir inAir9 SX1276 RF 915MHz 868MHz Wireless RAK811 LPWAN Module https://downloads.rakwireless.com/LoRa/RAK4200/Hardware-Specification/RAK4200_Module_Specifications_V1.4.pdf Class 2 Bluetooth Module with on-board components Moritz Klein (and derivatives Fix rail clearance issues, make all power main synth_tools/Schematics/SynthMages.pretty/Switch.lib 1741 lines main MK_VCO/Schematics/resistor_keyboard.diy 497 lines ebf8c2dd87 Move LED resistors next to transistors to save on panel wires Move LED resistors From d81094c64ef3dbd9cdcdc0341bc85fcc9deb080e Mon Sep 17 00:00:00 2001 Subject: [PATCH 13/13] re-re-remove the mysterious extra trace main Add scad for v3.2 eea453f1ee Notes about component heights, swapping rotary and toggle switches Notes about component heights, swapping rotary and toggle .../Unseen Servant/Unseen Servant.kicad_sch | 1 Hardware/lib/aoKicad | 1 | Conn_01x10 | Pin header 2.54 mm spacing