GARRIER_SYSTEM_RECEIVER_

Published:2009/7/3 4:21:00 Author:May | From:SeekIC

Used to detect,amplify,limit,and demodulate FM carrier modulated with audio ρrogram、for feeding up to 2.5 W to remote loudspeaker. Can be plugged into any AC outlet on same side of distribution transtormer. Carrier signal is taken lrom line by tuned transtormerr,. Output of two-stage Iimiter amplifier Q1A-Q1D is applied directlv to mute peak detector D1-Q2-C7. Limiter output is reduced to1 V P-P for driving National LM565CN PLL detector which operates as narrow-band tracking filter for input signal and provides low-distortion demodulated audio output. Mute circuit quiets receiver in absence of carrier.-J. Sherwin, N. Sevastopoulos, and T, Regan, FM Remote Speaker System, National Semiconductor, Santa Clara, CA, 1975, AN-146.



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