Hi guys, I have tapped the audio signal coming from my telephone. It´s about 0.05 volts if someone talks. Now I want to measure it with my arduino analog in pin if voltage is applied (if someone talks) and swicht a digital output high. (to light a LED to let my college know that I´m talking at th…

How to ground the arduino?

Lakes May 21, 2013, 12:50pm 4

I guess its illegal to connect this

to the phone network then.

Legal to sell, illegal to use?

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