====== ATB : APRS TELEMETRY BOX ======

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===== AX.25 MODEM =====
  * https://unsigned.io/micromodem-diy/

===== SENSORS =====

==== 4~20 mA CURRENT LOOP ====


==== TILT ====
===== POWER =====
  * 30~7VDC in → 5VDC out DC-DC step-down converter