VCO enables a hands-free car kit for cell phones

Abstract: 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. The circuit in Figure 1 can retransmit the audio signal from a cell phone to the FM broadcast band. When the user plac ...

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