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How could I evaluate the signals from the audio input so that it acts as a switch to turn on my Bluetooth Speaker?

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  • \$\begingroup\$ What kind of signals? \$\endgroup\$ – Eugene Sh. Feb 14 '17 at 20:56
  • \$\begingroup\$ Audio Signals which is coming into the Audio In of Bluetooth Speaker \$\endgroup\$ – karadayi Feb 14 '17 at 21:23
  • \$\begingroup\$ If it's a normal stereo socket, these usually have additional pin which gets shorted or opened when the jack is inserted. That might be the easiest choice. \$\endgroup\$ – anrieff Feb 14 '17 at 23:07
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LM311 comparator. Or any modern similar chip. LM311 has open collector and emitter on its output transistor so is easy to use with any power supply. http://www.ti.com/product/LM311

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