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2 Dec 2013

ap_vco_handsfree_car_kit

Locally broadcast your cell phone through FM band using MAX2606 from Maxim:

This design idea presents an integrated IF voltage-controlled oscillator (VCO) that can retransmit the audio signal from a cell phone to the FM broadcast band. By placing the cell phone’s speaker near the microphone, the user can use the phone as a hands-free device while driving.

[via]

VCO enables a hands-free car kit for cell phones - [Link]

One Response to “VCO enables a hands-free car kit for cell phones”

  1. Audioguru Says:

    This simple circuit is missing the pre-emphasis (treble boost) that all FM transmitters use. Then the de-emphasis (treble cut) in all FM radios will make the already muffled telephone sound even more muffled sounding.

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