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2017-01-04 21:51  
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FM stereo demodulator with stereo-monaural switch and audio muting. Recommended supply voltage is 9 volts. Standby current is 10 mA. Input impedance is 20K. Audio muting is on at 0.85 volt and off at 1.08 volts. Stereo indicator is on at input voltage of 12 mV RMS and off at input voltage of 8.4mV RMS. Stereo-monaural switching occurs at 1.13 volts for stereo and 0.82 volt for monaural. Component F is a 38 kHz band eliminate filter (courtesy GTE Sylvania Incorporated).