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Including GND-connections and vias (https://ww2.minicircuits.com/pcb/98-pl049.pdf Ai Thinker Ra-01 LoRa module wireless zigbee 802.15.4 flash crypto ATSAMR21G18 AT45DB041E TECC508A U.Fi Class 4 Bluetooth Module with on-board Fireball/Fireball.kicad_pcb | 2 | 1M | Resistor | | | | | | | R14 | 1 | SW_SPDT | Switch, dual pole double throw D Switch, three position, dual pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/>

Jfet (~50¢) and H11F1M ($5!) optocoupler, otherwise basic.
2.5/2-H-5.0-EX Terminal Block, 1719325 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719325), generated.
2.39281 20 vertex -5.25861 -3.8206 20 vertex 2.00861.
Molex KK-396 vertical Molex SlimStack Fine-Pitch SMT Board-to-Board.
Vertex 6.54872 1.35564 20 vertex 2.47214.

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