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Cell Phone MIC Input Signal Circuit

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sadeepa

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Hi!

I need to connect a small audio circuit to cell phones MIC input so I can hear the audio signal through the phone while I'm in a call.

The audio circuit that it needs output a beep or a note (not a melody).So when I give power to the circuit I can hear that beep via cell phone.

Does anybody have a small circuit that can connects to MIC input of the cell phone?

Thanks
 

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