TV_CONTROL_RECEIVER

Published:2009/7/23 22:10:00 Author:Jessie | From:SeekIC

Uses barium titanate transducer as microphone, tuned with 20-mh coil to provide peaks at control frequencies of 38.5 and 41.5 kc. Balanced discriminator detects the two ultrasonic tones. Frequency shift of continuous ultrasonic tone activates tuning-motor relay. Both audio and video are killed during tuning. Also provides remote on. off control of power.-N, Frihart and J. Krakora, Ultrasonic Tones Select Tv Channels, Electronics, 31:23, p 68-69.



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