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National LM1889N serves to interface dudio, color difference, and luminance signals to antenna terminals of TV receiver. Circuit allows video information from video games, test equipment, videotape reorders, and similar sources to be displayed on black-and-white or color TV receivers. LM1889N consists of sound subcarrier oscillator, chroma subcarrier oscillator, quadrature chroma modulators, and RF oscillators and modulators for two low VHF channels.-"MOS/LSl Databook," National Semiconductor, Santa Clara, CA, 1977, p 4-48-4-49.
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