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WIRELESS_IR_HEADPHONE_TRANSMITTER

2016-04-05 03:19  
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WIRELESS_IR_HEADPHONE_TRANSMITTER
Audio input from PL1 frequency modulates the VCO section of a 4046 PLL chip. The VCO out-put 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.