Wireless Transmitter for IR Headphone

wireless-circuit-schematic-diagram





This circuit shows a Wireless Transmitter for IR Headphone.



Audio input from PL1 frequency modulates the VCO section of a 4046 PLL chip. 

The VCO output drives Q1, a switching transistor. Q1 drives two IR LEDs. 

The signal produced is around 100 kHz, FM carrier VCO sensitivity is around 7.5 kHz/V.

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