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For the sake of limited space I'd like to connect two sound boards to one speaker. The boards would never be powered on at the same time, but I'm concerned that the voltage of one would travel through the speaker back to the other and damage the other board. Would diodes limit the flow so that wouldn't happen?

Terry


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If the boards are never powered at the same time, how about an automatic approach?

Connect a DPDT relay to the power source of one of the boards.  Connect the speaker to the two common leads of the relay contacts.  Connect the speaker output of the board that controls the relay to the N/O contacts of the relay.  Connect the speaker output of the board that doesn't control the relay to the N/C contacts of the relay.

This will totally isolate the speaker from the non-operating board, and allow you to have either one driving the relay.

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