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2014-11-22 07:53  
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Complete TV sound system that provides approximately 2 watts ofaudio power.Sound detection is accomplished through a coincidence discriminatorin thechipthat requlres only one RLC phase shift network,supply for the chip should be approximately 16 volts,Selectthe value of resistor R toobtain 11.6 volts at pin 14 ofthe ECG748(courtesy GTE Sylvania Incorporated).