I want to feed SIM800L a microphone signal.

I found this page in the datasheet and it worked but I need more a sensitive microphone. I want to hear voices in room as much as possible, like a spy bug. The SIM800L microphone input is designed for millivolt level signaly so I have problem with amplifier audio in.

How can I solve this?

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  • \$\begingroup\$ The module is designed to power the microphone directly. If you want to add a preamplifier, you'll have to power the microphone yourself. There are many examples on the web of how to do that. \$\endgroup\$
    – Dave Tweed
    Jun 21, 2020 at 12:14
  • \$\begingroup\$ Can i use common emiter amplifier ? If yes ,What is suitable Av of circuit ? \$\endgroup\$
    – yeganehhp
    Jun 21, 2020 at 13:54
  • \$\begingroup\$ Well, what's the difference between the level you're getting now and the level you want? This may require some experimentation. \$\endgroup\$
    – Dave Tweed
    Jun 21, 2020 at 14:34


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