I want to send a signal through the 3.5mm jack(microphone port) to an android mobile and process the signal using android mobile application I created.

But I don't know the voltage range the microphone port can sustain. Please help me.

  • \$\begingroup\$ electronics.stackexchange.com/questions/76010/… \$\endgroup\$ Feb 22, 2017 at 5:42
  • \$\begingroup\$ @LosFrijoles Your link is useful but does not really answer their question. \$\endgroup\$
    – Russell McMahon
    Feb 24, 2017 at 22:36
  • \$\begingroup\$ Well RaviSri, this question is impossible to answer. Which Android phone? Have you tried measuring voltage coming out of the port? There are several types of microphones; some require power and some do not. Voltage being present can help determine which type is expected, and thus how to approach a solution. That said, many devices employ a mux for the audio jack today because there are several types of incompatible plugs. I'd read up on electret microphones too, to understand how those work and why voltage is needed. So no, there is no easy answer for this. \$\endgroup\$
    – rdtsc
    Apr 21, 2017 at 21:40


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