IR headphone transmitter CD4046

Posted on Sep 10, 2012

The transmitter for the wireless headphones is built around a CD4046 CMOS phase-locked loop, coupled with a driver transistor, and a pair of infrared LEDs.

IR headphone transmitter CD4046
Click here to download the full size of the above Circuit.

Although the CD4046 is comprised of two phase comparators, a voltage-controlled oscillator (or VCO), a source follower, and a zener reference, only its VCO is used in this application.

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