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I want to make a bluetooth switch for my wireless router so I can restart it via my phone.

I have an old bluetooth hands-free so I'm wondering if it could be used as a power switch. I'm planing to connect it to the router's power and use a transistor to shutdown the router, the problem is that I don't know if I can use audio to control the transistor (maybe with a diode and capacitor?)

The idea is to connect the phone to the bluetooth and play an audio file (probably a high pitch tone) so the audio triggers the transistor and shuts off the router, then I'll stop playing the file and the power should come back to the router.

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Well, there are no answers yet so let me tell you what I found out.

The voltage from the bluetooth thingy is really low so a simple transistor won't work, instead you can use an opamp or a comparator to increase the audio voltage. I'm using a comparator.

After raising the voltage I'm planing to rectify (bridge and caps) the audio signal as good as I can (doesn't matter too much to me if it's not perfect), then the rectified voltage will activate a PNP transistor that will shutdown the router for a couple seconds as long as the audio file is played.

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