Sunday, November 10, 2013
Wireless IR Headphone Transmitter
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.
Wireless IR Headphone Transmitter Circuit Schematic
Wireless IR Headphone Transmitter Circuit Schematic
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