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BackLadder 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 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 IQRF TR-x2D(C)(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 without antenna Low-Power Long Range Transceiver Module LoRa Radio, RF, Module, http://www.hoperf.com/upload/rf/RFM69HW-V1.3.pdf 8 pin DIP socket | | R24, R26, R28 | 3 | 100R | Resistor | | | R9, R11, R13 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>