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Why does the Instant On Camera and its power supply use three wires?

April 26, 2017camera Instant power supply wires

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Why does the Instant On Camera and its power supply use three wires?

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The original power supply used two wires (power and ground). The Instant On power supply has three wires (two power, one ground). One of the power leads is X10 controlled. This means the camera circuitry receives constant power and the transmitter circuitry is controlled by X10 command.