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45_MHz_color_TV_sound_IF_amplifier_using_ECG703A

2014-11-22 00:33  
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45_MHz_color_TV_sound_IF_amplifier_using_ECG703A
4.5 MHz color TV sound IF amplifier using ECG703A. In a color TV the 4.5 MHz IF is not generated in the video detector as in B&W sets. A separate transistor sound detector, driven from thefinal video IF amplifier, is used to develop the 4.5 MHz IF. The drivertransformer at the input of the chip is tuned to 4.5 MHz. The output drives a conventional ratio detector, which provides good AM rejection well belowfull limiting (courtesy GTE Sylvania Incorporated).