Doppler Microwave Automatic Switch Circuit

Published:2011/7/13 7:17:00 Author:Michel | Keyword: Doppler Microwave, Automatic Switch Circuit | From:SeekIC

Microwave automatic switch controls the circuit according to microwave doppler effect and it can monitor moving objects and change the moving into electrical signals to control the electric light bulb or electronic appliances opening and closing. Working principle is same as the following oscillating circuit composed of antenna,T1 and C5.The antenna radiates to the space and it produces a microwave field radius if someone or object in microwave field, which will cause the mobile microwave frequency with about 10 m radius.It will causes microwave frequency shift if someboday or some object moves in the field.In the circuit,it embodies in the change of the voltage of the antenna, C4 will couple this change to the op-amp AD amplification, op-amp output AD forms voltage on R6, when it flows through C2.The voltage's highness and lowliness are relevant to the object distance and moving speed and it's usually between 0-3V.Op-amp AA connects to comparator,it's 0.4V when the reference voltage is 12V.



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