Enabling hands-free car kit for cell phones

The circuit discussed in this application note can retransmit the audio signal from a cell phone to the FM broadcast band. When the user places a cell phone speaker near the microphone, he or she can listen to the cell phone audio via the vehicle's FM radio. This can be used as an in-car hands-free speakerphone.

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Originally published by Maxim Integrated Products Inc.at www.maximintegrated.com as "VCO Enables a Hands-Free Car Kit for Cell Phones".