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BackAn expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp
- Connector, S04B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex Nano-Fit.
- Power Long Range LoRa.
- 3314S Potentiometer, vertical, Omeg.
- Which they Distribute, provided that the Covered Software.