Wireless Ir Headphone Transmitter Circuit

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. Although the CD4046 is comprised of two phase comparators, a voltage-controlled oscillator (or VCO),

a source follower, and a zencr reference, only its VCO is used in this application.

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