Sub-ultrasonic Remote Control Switch(NE555,LM567,CD4013) Circuit

Published:2011/7/29 5:47:00 Author:Sue | Keyword: Sub-ultrasonic, Remote Control | From:SeekIC

Signal with a frequency higher than 20kHz always can't be heard by human ears, so it is called ultrasonic wave. But in fact, signals with a frequency between 18-20kHz is also hard for human ears to recognise, espacially for those with small transmitting power, which is hardly heard by human ears. So signalsin this range is also called sub-ultrasonic signal. By using sub-ultrasonic signal as remote control signal, special ultrasonic receiver and transmitter are not needed, and human hearings will not be disturbed, so it is very economic and convenient.



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