Patent ID: 8538054

Claim:
A device for performing a switching operation in response to an externally applied DC control signal from an external audio load, the device comprising: an input connector that receives an input audio signal from an external audio source; an output connector having a conductor that provides an audio output signal; a DC isolator coupling to the input audio signal from the input connector, the DC isolator provides audio output signal to the conductor of the output connector, the DC isolator blocks the externally applied DC control signal from the input connector, the externally applied DC control signal switching between a first state and a second state; and a switch responsive to the externally applied DC control signal applied to the conductor of the output connector so as to perform the switching operation, the switch automatically switching to a first switch state upon the DC control signal switching to the first state and the switch automatically switching to a second switch state upon the DC control signal switching to the second state.