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The circuit selects automatically which audio source to use and turns on the amplifier. Based on automatic switch I have made earlier: http://www.electrobob.com/auto-amp/ Details: I need a 4 to 1 audio selector, so my amplifier can use which of the sources is available(PC, tablet, bluetooth, raspi).

The circuit selects automatically which audio source to use and turns on the amplifier. Based on automatic switch I have made earlier: http://www.electrobob.com/auto-amp/ Details: I need a 4 to 1 audio selector, so my amplifier can use which of the sources is available(PC, tablet, bluetooth, raspi). Simple relay switch and not a mixer, since some of the audio sources are "clean" some are "dirty".