WIRELESS_IR_HEADPHONE_TRANSMITTER

Published:2009/6/19 4:04:00 Author:May | From:SeekIC

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.



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