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Schematic
J1 : PIN 1 (+Vdd) ; PIN 2 (Gnd) ==> FROM Transformer (500amp)
J2 : PIN 1 (+3 Vol); PIN 2 (Gnd) ==> FROM PACK 2 AA
J3 : PIN 1 (+) ; PIN 2 (Gnd) ==> To Power of System Alarm or other things
Then you have power, the system use CC else use PACK 2 AA (or Baterie)
PCB
View 3D
Photo