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An LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.renesas.com/us/en/document/psc/package-drawing-hodfn-6pin-l615x16?language=en&r=568376 Miniature Crystal Clock Oscillator EuroQuartz XO91 series, http://cdn-reichelt.de/documents/datenblatt/B400/XO91.pdf, 7.0x5.0mm^2 package FOX SMD Crystal SERIES SMD7050/4 https://www.foxonline.com/pdfs/FQ7050.pdf, hand-soldering, 7.0x5.0mm^2 package SMD Crystal.

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