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HUM_BLOCKING_OPTOISOLATOR

2017-01-07 01:05  
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HUM_BLOCKING_OPTOISOLATOR
Optoelectronic isolator for audio feed in TV set prevents circulation of ground currents at line frequency, for protection of low-level signal runs from hum interference. Used in tuner providing quality sound and video outputs, circuits for which are given in four-part article. Optoisolator uses light-sensitive Darlington pair in conjunction with infrared-emitting diode. Diode current is adjusted with 50K variable resistor to give best compromise between noise and distortion.-D. C, Read, Television Tuner Design, Wireless World, Jan. 1976, p 51-57.