900MHz radio frequency indicator analysis circuit diagram

Published:2011/9/13 20:39:00 Author:Ecco | Keyword: 900MHz, radio frequency indicator, analysis | From:SeekIC

When the phone receives the signal sent by the base station in standby mode, it will send response signal, and cell phone antenna also has a short radio signal. At this point, if there is a tiny sensor next to the phone, it will emit red light, and some sensor will issue music, sound. Anatomy sensor circuit is actually a 900MHz radio frequency indicator. When there is no RF signal near the phone antenna, all will restore quiet. R1's size is relative to the magnification of VT1.



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