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IR_TRANSMITTER_FOR_TV_SOUND

2016-04-05 20:46  
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IR_TRANSMITTER_FOR_TV_SOUND
Mono audio output of TV receiver is fed to infrared modulator using Intersil 8038 IC and transistor.o provide pulse-frequency-modulated infrared output that can be picked up by compact receiver built into headphones S/N ratio is 58 dB in daylight in average living room having light walls and celling, but drops to 40 dB when receiver faces away from transmitter Used in German TV receivers displayed at 1975 Berlin Exhibition.-International Radio and Television Exhibition Wireless World Nov .1975, p 521-524 and 539.